How do you go from 98 to 720 using just one letter?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What is next number in the pattern below:

131 517 192 123 ?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

How many triangles are there on the puzzle below?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?