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Question 157
when 2/5 of a number is added to 169 , it becomes thrice of itself . What is the number ?
Solution
Let the number be $$x$$
=> $$\frac{2}{5} x + 169 = 3x$$
=> $$3x - \frac{2x}{5} = 169$$
=> $$13x = 5 \times 169$$
=> $$x = \frac{5 \times 169}{13}$$
=> $$x = 5 \times 13 = 65$$
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