Level 1 PSLE
Charles has a number of 10¢, 20¢ and 50¢ coins in the ratio 4 : 2 : 1. The total value of all the coins is $156. What is the total value of the 20¢ coins?
Level 3
A special tea is a mixture of three kinds of tea leaves A, B and C in the ratio 5 : 3 : 2.
1 kg of each kind of tea leaves costs $4, $20 and $10 respectively.
What is the cost of 15 kg of this special tea?
Level 3
The ratio of Henry's total points to that of Vincent's in a mock test was 6 : 7. In the next mock test, Henry's points increased by 70%. By what percentage must Vincent's points be increased if their total points were to be the same? Round off the answer to the nearest whole number.