Question

if a number is divisible by 9 and 10 both then it must be divisible by 90 dash​

Answer 1

Step-by-step explanation:

If a number is divisible by 9 and 10 both, then it must be divisible by 90. True. This is because if a number is divisible by two given co-prime numbers then it is also divisible by their product. We know that 9 and 10 are co-primes and their product is equal to 90