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Is it too difficult to take the math expansion test in the fourth grade of primary school?
The rope used to wrap around the post is x cm long and y cm long.

rule

Two laps around the post will make the rope 40 centimeters more; Y-2X=40

Three times around the pillar, the rope is 20 cm less; 3X-Y=20

Equation:

Y-2X=40

3X-Y=20

Solution: rope length Y= 160 cm.

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