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Some of the maths puzzles with answers are as follows :

**1 - Suppose, you have 10 Orange and 10 friends. You give each of your friends one orange . Now all your friends have one Orange each. But there is still an Orange left in the basket. How is this possible ?**

**Answer: **The question is actually very simple but makes us think in complicated ways. After giving 9 Orange to 9 friends, give the 10th friend the basket along with the 10th Orange in it. This is all that it takes to think differently.

**2 - Find a 10-digit number where the first digit is how many zeros are in the number, the second digit is how many 1s are in the number, etc. until the tenth digit which is how many 9s are in the number.**

**Answer: **6210001000

**3 -** **What is the following number? 18, 21, 24, 27, 30, 33, 36, ______________**

**Answer:** We have an arithmetic series over here in which every successive number is greater by 3. So the sequence will be: 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, and so on.

4 - **Hari had 6 siblings who were all born 2 years apart. The youngest is Richa who is only 7 years old while Hari is the oldest. What is Hari’s age?**

**Answer:** Richa, the youngest sibling is 7 years old. Each sibling was born 2 years apart, and there are a total of seven children (Hari and his 6 siblings). Therefore, Hari’s age is: 7 + 2 + 2 + 2 + 2 + 2 + 2 = 19.

**5 - Ravi lives in a village that is next to a forest. One day he met with a genie. The genie granted Ravi one wish. Ravi wished for 100 grams of gold. The genie agreed and offered Ravi 100 grams of gold. Shocked and feeling upset that he asked for so little, Ravi requested the genie for another wish. The genie agreed on one condition that he would come back the next month on any date and Ravi would need to present him with gold rings. However, the gold rings have to be of the same weight as on the date on which the genie arrived. This means that if the genie came on the 20th, he would need 20 grams of gold. What did Ravi do next?**

**Answer:** This is a challenging maths riddle because the date is unknown. If Ravi decided to make a different gold ring for each day, it will be a problem because he has only 100 grams of gold. So, if he made a gold ring of 31 grams, 30 grams, 29 grams, and 27 grams, he would run out of gold. So what should he do? The solution is to make 5 rings of weight 1 gram, 2 grams, 4 grams, 8 grams, and 16 grams. These numbers can be used to reach any combination up till the number 31. For example: 24th day: 16+8, 13th day: 8+4+1, 31st day: 16+8+4+2+1 etc.

**6 - ****If Radha is the 50th fastest and slowest runner in her school, how many students are there in her school?**

**Answer:** 99 students.

50th Fastest when you count in sequence from 1, Radha comes on 50.

50th Slowest when you count in sequence from 99, Radha is again on 50.

**7 - Six Wolves can catch six lambs in six minutes. So how many wolves will catch 60 lambs in sixty minutes?**

**Answer:** 1 wolf can catch 1 lamb in six minutes. In 60 minutes, each wolf can catch 10 lambs. So, 6 wolves can catch 60 lambs in 60 minutes.

**8 - ****What weighs more – A kilo of apples or a kilo of iron?**

**Answer:**** **They weigh the same. Each weighs exactly a kilo.

**9 - ****Last weekend, Jack went to play in the park near his house. He rode the new bicycle gifted by his grandma. After reaching the park, Jack saw that there were 14 tricycles and bicycles. If there were 38 wheels in total, how many tricycles were there in the park?**

**Answer:** There were 10 tricycles which will make up 10*3 = 30 wheels and 4 bicycles which will make up 4*2 = 8 wheels. In total, there were 30+8 = 38 wheels.

**10 - ****If there are five monkeys and each one takes 5 minutes to eat 5 bananas. How many minutes would 4 monkeys take to eat 4 bananas?**

**Answer: **Each monkey eats 5 bananas in 5 minutes, so 1 banana in 1 minute. So, if there are 4 monkeys and 4 bananas, they will take 1 minute only.

**11 - ****The age of a father and a son add up to 66. The age of the dad is the age of the son reversed. How old could they be?**

**Answer:** There are three different answers for this: the father and son could be 51 and 15 years or 42 and 24 years old or 60 and 06 years old. Each of these combinations would add up to give 66 as a total.

**12 - ****A scientist engineered a new plant that could double its size every day. He made it grow in a circular pond with a circumference of 600 meters. If he planted it in the southern part of the pond, and the plant-covered half the pond in 28 days, how many days would it take to cover the full pond?**

**Answer: **29 days.

As mentioned in the beginning, the plant doubles in size every day. So if it already covered half of the pond in 28 days, then it will just get doubled on the 29th day and cover up the whole pond.

**13 -** **There are 2 buckets, a 5 liter, and a 3-liter bucket. Fill the 5-liter bucket with 4 liters of water using just these two buckets to measure.**

**Answer: **Fill the 3-liter bucket fully. Pour it into the 5-liter bucket. Again fill the 3-liter bucket. Pour the remaining 2 liters into the 5-liter bucket. Pour the 5-liter bucket completely and fill it with the 1 liter remaining in the 3-liter bucket. Again fill the 3-liter bucket and pour it into the 5-liter bucket.

**14 - ****Two fathers and two sons go fishing. Each of them catches one fish. So why do they bring home only three fish?**

**Answer: **The fishing group comprises a grandfather, his son, and his son’s son. So, there are just three people.

**15 - ****At the time of shipping, Tom can place 10 small boxes or 8 large boxes into a carton. A total of 96 boxes were sent in one shipment. The number of small boxes was less than large boxes. What is the total number of cartons he shipped?**

**Answer:** 11 cartons

4 small boxes (4*10 = 40 boxes)

7 large boxes (7*8 = 56 boxes)

So 96 boxes and 11 total cartons