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Standard VII

Mathematics

Solving Equations with Linear Expressions on One Side and Numbers on the Other Side

My sister's a...

Question

My sister's age today is 3 times, what it will be 3 years from now - 3 times what her age was 3 years ago. Find the present age

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Solution

lets take sisters age as x
x =3(x+3)-3(x-3)
x=3x+9-3x+9
x=18

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My sister's age today is 3 times, what it will be 3 years from now - 3 times what her age was 3 years ago. Find the present age

lets take sisters age as x x =3(x+3)-3(x-3) x=3x+9-3x+9 x=18

lets take sisters age as x
x =3(x+3)-3(x-3)
x=3x+9-3x+9
x=18