The ratio of two number is 7 : 3 & their HCF is 21. Find the numbers

Let the numbers be 5x and 6x respectively

HCF of 7x and 3x = x

Now, according to the question

HCF = x = 21

Now, Numbers = 7x = 7 × 21 = 147

Second number = 3x = 3 × 21 = 63