12. a fruit basket contains oranges and grapefruits. one-third of the orange
and one-fourth of the grapefruits were spoiled. you threw away 4 oranges
and 7 grapefruits. how many pieces of fruit were in the basket?

There were 12 + 28 = 40 pieces of fruit in the basket.

Step-by-step explanation:

Suppose there were x oranges and y grapefruit.

Then we have

1 /3 x =  4

x = 4*3 = 12.

1/4 y = 7

y = 7*4 = 28.

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answer: d.) the total number of protons and neutrons is 15

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