What has a ring but no finger?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

Can you find the six hidden animals in the picture below?

Can you count the number of triangles in the given figure?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Find the next number in the series

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

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Spot 5 differences in two Christmas tree below:

Can you convert the number zero(0) into a positive number using just one mathematical operator ?