Level 3
There were pink, yellow and blue stamps in a container. Sean put another 6 pink stamps and 10 blue stamps in the container, then the ratio of the number of yellow stamps to the number of blue stamps became 5 : 3. Then, he doubled the number of pink stamps and removed 28 blue stamps. The ratio of the number of pink stamps to yellow stamps became 2 : 1. He counted and found that there were a total of 62 stamps left in the container. Find the number of pink stamps that he had at the beginning.

Level 3
There were some grapefruits and durians in Container A and Container B. In Container A, the ratio of the grapefruits to the number of durians was 3 : 1. In Container B, the ratio of the number of grapefruits to the number of durians was 3 : 2. There were 2 times as many fruits in Container A as in Container B. After 56 durians were put into Container B, the ratio of the number of grapefruits to the number of durians in Container B became 1 : 2. How many fruits were there in Container A?

Level 3
Hazel, Olivia and Diana had a total of 767 marbles. The ratio of Olivia's marbles to Diana's marbles was at first 4 : 7. After Hazel and Olivia each gave half of their marbles away, the 3 children had 527 marbles left. How many marbles did Hazel and Diana have at first?

Level 3
In a factory, Machine A was turned on first and it produced 313 wontons. Then Machine A and Machine B were turned on at the same time to continue production. For every 4 wontons Machine A produced, Machine B produced 6 wontons. Machine B produced 45 less than ¹₂ of the total number of wontons produced. How many wontons were produced altogether?

Level 3
Tim had 672 coins. ²₇ were pink and the rest were yellow and blue. The ratio of the number of yellow coins to the number of blue coins was 1 : 3. Tim decided to buy some more pink coins to increase the number of pink coins to half of the total number of coins.

1. How many less yellow coins than pink coins did he have at first?
2. How many more pink coins did he have to buy?