Question

If
a.b = 4:9anda : c = 2 : 3, then (a +
b.: (a +
c.is (a) 15: 13 (b) 10 : 13 (c) 13: 1 0 (d) 13: 15

Answer 1

a:b=4:9=4×2:9×2=8:18
a:c=2:3=2×4:3×4=8:12
(a+b):(a+c)=(8+18):(8+12)=26:20=13:10