Whole numbers

  1. Mr Wu bought 3 shirts and 4 T-shirts for $140. A shirt cost twice as much as a T-shirt. Find the cost of a T-shirt.
  2. Weiwei paid $252 for a watch, a radio and a calculator. The watch cost $18 more than the radio and the radio cost $12 more than the calculator. How much did each item cost?
  3. Mr Fu paid $404 for some jackets and T-shirts. A jacket cost $20 and a T-shirt was $8 cheaper than the jacket. If he bought 7 more T-shirts than jackets, how many jackets and how many T-shirts did he buy?
  4. On Tree-planting day, 40 pupils planted some trees. Each boy planted 3 trees and each girl planted 2 trees. The boys planted 30 more trees than the girls. How many boys were there?
  5. A group of people met at a party. Each person shook hands with everyone else. Mr Li shook hands with 4 times as many men as women. How many men and how many women were there at the party?
  6. A big tank had 890 litres of water. A small tank had 170 litres of water. When an equal amount of water was added to both tanks, the big tank had 3 times as much water as the small tank. How much water was added to each tank?
  7. A container weighs 15 kg when it is filled with liqued A. The same container weighs 6 kg when it is filled with liquid B. If liquid A is 3 times as heavy as liquid B, what is the weight of the container?
  8. Mingli had 4 times as much money as Peter. After Mingli gave Peter $600, Peter had 4 times as much money as Mingli. How much money did they have altogether?
  9. Lily and Mary had the same amount of money. After Lily spent $18 and Mary spent $25, Lily had twice as much money left as Mary. How much money did each girl have at first?
  10. Meilin had $30 more than Fuhua. If Fuhua gave Meilin $10, Meilin would have twice as much money as Fuhua. How much money did Meilin have at first?
  11. Lily and Meihua had $120 altogether. After Lily gave Meihua $18, Meihua had twice as much money as Lily. How much money did each girl have at first?
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