Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?

How many Watermelons are there in the below picture?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

How many times do a clock's hands overlap in a day ?