根据句子意思列出算式,并计算出正确答案。
Joy has eleven books.
His father buys five books for him.
How many books does Joy have now?
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Sam has thirteen apples in a bag.
Ben takes four apples away.
How many apples does Sam have now?
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There are nine boxes of chocolate on a table.
A woman puts six more boxes of chocolate on the table.
How many boxes of chocolate are there now?
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There are twenty bottles of juice in a store.
A man takes seven bottles of juice away.
How many bottles of juice are left in the store?
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