1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Count the number of triangles in the picture below:

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What's the best place to go shopping in the ocean?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?