In a mixture of 70 kg, the ratio of sand and cement is 4 : 1. How much sand should be added to the mixture so that the ratio of sand and cement in it becomes 6 : 1?

Explanation

Given that– 5 Unit → 70 $\because$ 1 unit = 14 kg. $\therefore$ 6 unit = $14 \times 6 = 84$ kg. Hence the required amount of additional sand to the mixture for desired ratio = $84 - 56 = 28$ kg.