how to solve this sum
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let the present age of younger brother be y and the age of elder brother be x.
atq:
x-y=10 (1)
15 years ago:
their ages
x-15
y-15
now
x-15=2 (y-15)
x-15-2y+30=0
x-2y+15=0
x-2y=-15 (2)
substract (1) from (2)
x-2y=-15
x-y=10
-y=-25
y=25
on putting y=25 in (1) x=35
atq:
x-y=10 (1)
15 years ago:
their ages
x-15
y-15
now
x-15=2 (y-15)
x-15-2y+30=0
x-2y+15=0
x-2y=-15 (2)
substract (1) from (2)
x-2y=-15
x-y=10
-y=-25
y=25
on putting y=25 in (1) x=35
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