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Math problems in the sixth grade. Solve by equation
Solution: Suppose Yuanyuan's home is about X kilometers away from Grandma's.

10+(x-3)* 1.8 = 13.6

10+ 1.8x-5.4 = 13.6

1.8x = 13.6+5.4- 10

1.8x=9

x=5

It's about 5 kilometers from Yuanyuan's home to Grandma's.