Answer :
3:4, Just find the greatest common factor for both numbers, then divide both numbers by the most common factor. For this, greatest common factor is 6, so you would do 18 ÷ 6 = 3 and 24 ÷ 6 = 4.
Just divide 18 and 6 it would equal 3 and do the same with 24 and 6 and you get 4 so the ratio would be 3:4