(16:4)*(25:5),(32:4)*(14:7),(28:4)*(40:8),(35:5)*(12:3).

Question

(16:4)*(25:5),(32:4)*(14:7),(28:4)*(40:8),(35:5)*(12:3).

Answer 1

16:4)*(25:5) =4*5=20
32:4)*(14:7)=8*2=16
(28:4)*(40:8)=7*5=35
(35:5)*(12:3)=7*4=28