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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Ratio and Proportion
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Q)

A sum of Rs. 36.90 is made up of 180 coins which are either 10 paise coins or 25 p coins. The number of 10 p coins is:


( A ) 48
( B ) 54
( C ) 56
( D ) 60

1 Answer

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A)

Total number of coins = 180

Let x be number of 10p coins and y be number of 25p coins

x+y=180-----(i)

Step (ii) Given 10p coins and 25p coins make the sum = Rs. 36.90 

10x/100+25y/100=36.90

10x+25y=3690-----(ii)

Step (iii) 

Solving (i) and (ii),

 

10x+10y=1800

10x+25y=3690

y=126

x=54

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