can you please explain me the sum.
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She collected 25 1 rupee coins.
She collected "double" of the real amount of coins that is, she collected 50 2 rupee and 5 rupee coins.
sum of the above =( 1×25) + (2×50)+(5×50) =375.
number of ten rupee coins = (525-375)÷10
=150÷10 = 15.
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