Question

Aslam,s age was half of his father,s age,but after 15 year,s his age was just 1/3rd of his father,s age. Find his percentage.

Answer 1

x = aslam age
y = father age
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y = 2x
y - 15 = 3(x - 15)
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put the system of linear equations into standard form
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2x - y = 0
y - 15 = 3x - 45
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2x - y = 0
3x - y = 30
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solution:
x = aslam age = 30
y = father age = 60