Question

answer for a bill of rupees 14.20 is paid with 10paise and 20 paise coins. 5times the number of 20paise coins exceeds 7 times the number of 10paise coins by 30 how many of each are used

Answer 1

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Let the no. of 10 paise coins be x.

And the no. of 20 paise coins be y.

A.T.Q

10x+20y=1420

x+2y=142   ...(1)

5(y)=7(x)+30

5y−7x=30   ...(2)

From (1), we get

x=142−2y

Substitute the value of x in eqn (2),

we get

5y−7(142−2y)=30

5y−994+14y=30

19y=1024

y=1024/19=53.89 _____answer

x=142−2(53.89)

=142−107.7=34.3 -______answer

So, Approximately 10 paise coins are 
used 35.and 20 paise coins are used 54.

I think my answer is capable to clear your confusion

hope it will help you

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