Question

One number is 4 times another. their product is 16 times their sum. find the numbers.

Answer 1

let the 2 numbers be x and y. then x=4y. xy=16(x+y)
4y²=16(5y)
4y²-80y=0
4y(y-20)
y=0 or y=20
x=4*20=80

the numbers are 20 and 80