madiiiiiii69
20.09.2020 •
Mathematics
Twin brothers, Billy and Bobby, can mow their grandparent's lawn together in 112 minutes. Billy could mow the lawn by himself in 15 minutes less time that it would take Bobby. How long would it take Bobby to mow the lawn by himself?
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Ответ:
38 = 3x-1+x+3x-1-2
38 = 7x-4
7x=42
x=6 km --> second day
Test: 38 = (3*6-1)+6(3*6-1)-2)
--> frist day: 3*6-1 = 17 km