16 litres of alcohol-water mixture in ratio 3 ∶ 1 is mixed with 20 litres of milk-water mixture in ratio 4 ∶ 1. Find the percentage of water in the new mixture.
Quantity of water in 16 litres of alcohol-water mixture = 1/4 × 16 = 4 litres
Quantity of water in 20 litres of milk-water mixture = 1/5 × 20 = 4 litres
Quantity of water in (16 + 20 = ) 36 litres of new mixture = 4 + 4 = 8 litres
∴ Required percentage = 8/36 × 100 = 22.22%
4. What should come in place of question mark ‘?’ in the following series? 15, 19, 28, 44, ?
5. Find out the wrong number in the series. 3, 4, 10, 43, 348, 5583
7. What should come in place of question mark ‘?’ in the following number series? 7, 16, 11, 20, ?
8. What should come in place of ‘?’ in the following number series? 6, 7, 15, 24, 88, ?