Question

If 15% of x = 20% of y, then find x:y

Answer 1

15*x/100=20*y/100
=>15x/20y=1
=>3x/4y=1
=>x/y=4/3

=>x:y=4:3

Answer 2

$15 \div 100 \times x \\ = 15x \div 100 \\ = \: x = 100 \times 15 \\ x = 1500 \\ 20 \div 100 \times x \\ = x = 20 \times 100 \\ x = 2000$
x/y= 1500/2000
x:y= 15:20.