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2.Tom wants to give his mother a happy surprise( 吃惊),but his

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2.Tom wants to give his mother a happy surprise( 吃惊),but his younger brother let the cat out of the bag.译:3.\x05In the dancing party the students let their hair down.译:4.Don’t get a word in when others are talking.译:5.Making kites is child’s play.All of us can do it.译:
只需回答这一题,前面的发错了:I have only $10 and $20 bills in my pocket.There are three times as many $20bills than $10 bills.I have a total of $490.How many $20 bills do I have?
设10元币有X张,20元币有Y张,依题意得:
Y=3X,
10X+20Y=490
联立求解得,Y=21(张)
So I have 21 sheets $20 bills.