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Answer to Question #12894 in Other Math for manisha

Question #12894
A bag contains a number of 10paise,20 paise and 25 paise coins inratio 7:3:4. If value of money comes to Rs.90 then the number of 25paise coins in the bag is?
Expert's answer
Let the number of 25paise coins in the bag is 4*X.
Then the value of money: V
= 7*X * 0.1 + 3*X * 0.2 + 4*X * 0.25
V = 0.7*X + 0.6*X + X
V = 2.3*X =
4*X = approx. 157 coins

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