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JOe goes to the gym to run and swim. When running he burns 35 calories per minut, and...
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Let Joe runs for x minutes,
and he swims for (23-x) minutes.
Number of calories burnt in running is 35*x,
And the number of calories burnt in swimming is 30*(23-x).
Joe burns 730 calories in total (running plus swimming).
35x + 30(23-x) = 730
`rArr` 35x + 690 - 30x = 730
`rArr` 5x = (730-690) = 40
`rArr` x = 40/5 = 8.
So, Joe runs for 8 minutes and swims for (23-8) = 15 minutes.
Posted by llltkl on June 2, 2013 at 12:08 AM (Answer #1)
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