Question

the H. C. F and L. C. M of two numbers is respectively 14 and 280.if one of the numbers is 70 then the second number will be option 1) 56. 2) 40. 3)100

Answer 1

56 is the right answer

Answer 2

hcf×lcm=a×b
14×280=70×b
b=14×280/70
b=56