Level 3
Mrs. Tay had an equal number of pears and apples at first. She sold half of the apples and bought another 42 pears. In the end, she had thrice as many pears as apples. Find the number of apples she had at first.
Level 2
Tom has 20 female guppies and 10 male guppies. If he gives away 5 female guppies and 5 male guppies, what fraction of the guppies left are female?
Level 2
Harris sold 8 cats, 5 hamsters and some birds. He sold 7 more birds than hamsters. What fraction of the total number of animals sold were hamsters?
