A woman can plait hair for 20 girls in 5 days. How long will it take her to plait
for 12 girls?

12 x 5 = 60

60 divided by 20 = 3

It will take her 3 days to plait 12 girls .

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Find the solution of this system of equations -7x+y=-20 9x-3y=36

Aliaa is skating down a ramp. the wheels on her skateboard have diameters of 60 \text{ mm}60 mm60, space, m, m. what is the distance aliaa travels when her skateboard wheels make 202020 revolutions? round your answer to the nearest \text{mm}mmm, m.