Level 3
Mrs Lin bought 5 kg of shrimp and 2 kg of beef for $96. If she brought 2 kg of shrimp and 5 kg of beef, she would have to pay $3 less. How much did 1 kg of shrimp cost?
Level 3
There are 151 marbles in a big basket and a small basket altogether. The total number of marbles in 3 big baskets and 8 small baskets is 568. How many more marbles are there in a big basket than a small basket?
Level 3
The total cost of 5 suits and 5 hoodies was $285. Tina bought 7 such suits, 5 such hoodies and a cardigan for $543. If the total cost of a cardigan and a suit was $150, find the difference in cost between the suit and the cardigan.
Level 3
When Mrs Yang was 45 years old, her son was 2 times her daughter's age. Mrs Yang would be twice her son's age when her daughter was 30 years old. How old would Mrs Yang be when her daughter was 18 years old?
Level 3
Oscar is 3 times as old as his brother. In 14 years' time, Oscar will be 10 years less than twice of his brother's age. How old was Oscar 2 years ago?
