Question

After 15 years , Mary’s age will be four times of her present age. Find her present age.

Answer 1

Answer:

5

Step-by-step explanation:

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Answer 2

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• The present age of Mary = 15 years

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$\bullet\;\;\underline{\textbf{\textsf{Given:-}}}$

• After 15 years , Mary’s age will be four times of her present age.

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• The present age of Mary = ?

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Let the present age of Mary be y.

$\bullet\;\;\underline{\textbf{\textsf{After 15 years:-}}}$

• The present age of Mary = y + 15

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$\bf\underline{\red{\:\:\:\:\:\:\:\:A.T.Q:-\:\:\:\:\:\:\:}}$

$\longrightarrow \sf {y + 15 = 4y}$

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$\longrightarrow \sf {4y - y = 15}$

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$\longrightarrow \sf {3y = 15}$

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$\longrightarrow \sf {y = \cancel\dfrac{15}{3}}$

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$\longrightarrow{\underline{\boxed{\sf{y = 5}}}}$

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$\bullet\;\;\underline{\textbf{\textsf{Therefore:-}}}$

• The present age of Mary = 5 years

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