(3/2) = p/k

(p - (10×3/5))/(k - (10×2/5) + 10) = 2/3

(p - 6)/(k + 6) = 2/3

2k + 12 = 3p - 18

3p - 2k = 30

3(3k/2) - 2k = 30

k = 12

p = 12 × 3/2 = 18

**Which means initially **

Petrol = 18 Litres

Kerosene = 12 Litres

Total = 30 Litres

**& afterwards**

Petrol = 18 - (10×3/5) = 12 Litres

Kerosene = 12 - (10×2/5) + 10 = 18 Litres

Total = 30 Litres.