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
A burger cost three times as much as a sandwich at a cafe. Mr Lim spent ¹₄ of his money on some sandwiches and half of the remaining sum on 2 burgers. He had $30 left.

1. What was the cost of 1 sandwich?
2. Mr Lim bought 5 burgers and 6 sandwiches. How much did he spend altogether?

Level 3
Tom is thinking of a Y-digit number.

1. It has '1' as one of the digits.
2. The digit '2' is in its hundreds place.
3. The value of the digit '5' is 50.
4. The digit in the thousands place is twice the digit in the hundreds place.
5. The digit in the thousands place is 2 times the digit in the ones place.

What number is he thinking of?