Сократите дроби 5/15, 13/26, 15/40, 24/32, а потом приведите их к знаменателю 24.

5/15 = 1/3 = (1•8)/(3•8) = 8/24;
13/26 = 1/2 = (1•12)/(2•12) = 12/24;
15/40 = 3/8 = (3•3)/(8•3) = 9/24;
24/32 = 3/4 = (3•6)/(4•6) = 18/24.