If 2 times 3 equals 10, 4 times 5 equals 36, and 6 times 7 equals 70, then 8 times 9 equals?

In a row of 40 students Ravi is 15th from left. Position from right?

Which organelle is known as the powerhouse of the cell?

Complete series: Z, Y, X, W, ?

In a family of 8 members, A and B are married couple. A is male. C is the son of D, who is the brother of E. E is the daughter of F, who is the mother of G. G is the sister of A. How is C related to B?

Find next: 5, 10, 20, 40, ?