Question
Last weekend, Albert, his wife, his 20 year-old son and 15 year-old daughter visited the zoo. The admission fees are as follows:

Adult (above 12) $21
Child $6

How much did the family pay altogether?
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Last weekend, Albert, his wife, his 20 year-old son and 15 year-old daughter visited the zoo. The admission fees are as follows:

Adult (above 12) $21
Child $6

How much did the family pay altogether?