SOLUTION: Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. How old is Luis now and What will the brothers age be next year?

SOLUTION: Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. How old is Luis now and What will the brothers age be next year?

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Question 135877: Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. How old is Luis now and What will the brothers age be next year?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Let L be Luis' age now, b=brother's age.
L=b+10
L+1=3(b+1)
.
b+10+1=3b+3 Substitute b+10 for L.
b+11=3b+3
b-b+11-3=3b-b+3-3
8=2b
2b/2=8/2
b=4
Luis is 14 yo
Next year his brother will be 5.
.
Ed
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