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Question

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


Solution

Let present age of Mary $$=m$$

After $$25$$years, mary's age $$=4m$$
$$4m=m+15$$
$$3m=15$$

$$m=5$$
$$\therefore$$     Present age of mary is $$5$$ years.

Mathematics

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