A fruit basket contains oranges and grapefruits. one-third of the oranges and one-fourth of the grapefruits were spoiled. you threw away 4 oranges and 7 grapefruits

1/3 oranges were spoiled ... u threw away 4 oranges ...

1/3 of what = 4 ...

1/3x = 4

x = 4 * 3

x = 12 oranges

1/4 grapefruits were spoiled ... u threw away 7

1/4 of what = 7

1/4x = 7

x = 7 * 4

x = 28

so ur fruit basket contained 12 oranges and 28 grapefruits before u discarded the spoiled ones