sws._.
Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?



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sauravshakya
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Let the present age of Christopher and Michael be x and y then,
x=4y ........i
x10 = 9(y10) .....ii

sauravshakya
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Solve that two equations

sws._.
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for x in the second equation do I put 4y? so the equation would look like 4y10=9(y10) ?

sauravshakya
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Yep....... Now solve for y

sws._.
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okay

sauravshakya
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Then plug the value of y u get in eqn i to find x

sws._.
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when i was solving the equation with the y i distributed and got 4y10=9y90

sws._.
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then after that i added 9y to 4y

sws._.
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and got 13y

sauravshakya
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4y10=9y90
10+90=9y4y

sauravshakya
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got your mistake?

sws._.
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ohhh

sws._.
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yes i did

sauravshakya
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So, what is the value of y

sws._.
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16?

sauravshakya
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YES

sauravshakya
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Now what is the value of x then

sws._.
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64?

sauravshakya
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Very correct

sws._.
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okay :) thank you

sauravshakya
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WELCOME