If a number is divisible by 9 and 10 both, then it must be divisible by 90. ?
If a number is divisible by 9 and 10 both, then it must be divisible by 90 is a true statement because if a number is divisible by two co-prime numbers then it is divisible by its product also. Here, 9 and 10 are co-prime numbers and 90 can be expressed as 90 = 10 × 9.
