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Mathematics Olympic starting line fifth grade volume eighth lecture 10 The answer is kneeling! ! ! ! ! ! ! ! ! ! ! ! Urgent! ! ! ! ! ! ! !
Solution: Suppose there are X five-dollar bills and Y two-dollar bills in the piggy bank.

The equation can be listed according to the meaning of the question: Y-X=22.

5X-2Y=40

Solution: X=28 Y=50

28×5+50×2+36× 1=276

Answer: Xiaohong saved 276 yuan in her piggy bank.

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