word problem for mathematics

Mathematics
Tutor: None Selected Time limit: 1 Day

May 20th, 2015

Let x = time it takes Billy to mow the lawn himself

Let y = time it takes Bobby to mow the lawn himself

Then,

x + y = 71

and

x = y - 30

Substitute

y - 30 + y = 71

2y = 101

y = 50.5

y = 51 minutes

May 20th, 2015

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