At first, 70% of the crayons in a box were blue and the rest were red. After Tze Jun placed another 36 blue crayons and 42 red crayons into the box, the ratio of the number of blue crayons to the number of red crayons became 5:3. How many crayons were there in the box in the end ?
Solution:
Mr. Tan packed 508 tarts into large and small boxes to sell. He filled each large box with 20 tarts and each small box with 12 tarts. All the boxes were full and there was no left over. What was the least number of boxes used by Mr. Tan ?
Gerald, Michael, and Pritam had 288 counters altogether. After Gerald gave Michael some counters, Michael had twice his original number of counters. Then Michael gave Pritam some counters and Pritam had twice his original number of counters. All the boys had an equal number of counters in the end. How many counters did Gerald have at first?
Tanya, Mariah, and Devi donated some money to charity. Tanya donated 2/3 as much as the total donation made by Mariah and Devi. Mariah donated 1/2 as much as than as the total donation made by Tanya and Devi. Devi donated $138 less than Tanya. How much did Mariah donate?
