Question

the lcm and hcf of two numbers is 4 and 560 respectively if the first number is 28 find the other number

Answer 1

let the other number be x
LCM X HCF = 28 x
$4 \times 560 = 28 \times x \\ x = \frac{4 \times 560}{28} \\ x = 4 \times 20 \\ x = 80$