Level 3 PSLE 4 m
A grocer had the same number of lemons, water apples and starfruits at first. After 78 starfruits, some lemons and water apples were set aside, there were 148 fruits left. There were thrice as many lemons as water apples left. The number of starfruits left was 20 less than the number of lemons. How many water apples were set aside?