Question

Lcm of two numbers is 180.what are the two numbers with ratio 4:5?

Answer 1

Let two numbers be 4x and 5x;

their will be LCM = 180 × HCF = x;  

1st number × 2nd number = LCM×HCF

Or, 4x × 5x = 180 × x;

Or, 20x = 180;

Or, x = 9;

then, the smaller number = 4×9 = 36.