Question

Find x and m: `("m" + 9)/(3"m" + 15) = 5/3`

Answer 1

Cross multiplying, we get

∴ (m + 9) × 3 = 5 × (3m + 15)

m × 3 + 9 × 3 = 5 × 3m + 5 × 15

Transposing 3m and 75, we get 

27 – 75 = 15m – 3m

– 48 = 12m

`(12"m")/12 = (-48)/12`

⇒ m = – 4