LCM and HCF

Finding the no if nos are given in ratios and their LCM or HCF is also given

The LCM of two numbers is 20 times of their HCF and (LCM + HCF) = 2520. If one number is 480, what will be the triple of another number?

For positive x and y, the LCM is 225 and HCF is 15 There.

LCM (a,b) xx HCF(a,b)= _________

If two numbers are equal,then their LCM is equal to their HCF their LCM is less than their HCF their LCM is equal to two xx their HCF None of these

("HCF of given fraction")/("LCM of given fractions") =(HCF " of numerators" xx HCF " of denominators")/("LCM of denominators" xx) ______.