SOLUTION: Twin Brothers,andy and brian can mow their grandparents lawn together in 18 minutes. Brian could mow the lawn by himself in 15 minutes more than it would take Andy. How long would
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Question 736291: Twin Brothers,andy and brian can mow their grandparents lawn together in 18 minutes. Brian could mow the lawn by himself in 15 minutes more than it would take Andy. How long would it take each person to mow the lawn alone?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If A can do a job in x time periods, then A can do 
of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do 
of the job in 1 time period.
So, working together, they can do
of the job in 1 time period.
Therefore, they can do the whole job in:
time periods.
For this problem:
But 
Make the appropriate substitutions and then solve for 
. Then calculate 
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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