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Question

A sum of ₹500 is in the form of denominations of ₹5 and ₹10. If the total number of notes is 90, find the number of notes of each type.


A
80, 10
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B
15, 75
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C
70, 20
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D
79, 21
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Solution

The correct option is D 80, 10
Let the number of ₹ 5 notes=x
The number of ₹ 10 notes=90x
Total value of ₹ 5 notes =5x
Total value of ₹ 10 notes =(90x)×10=90010x
5x+90010x=500
5x=900500
x=4005
x=80
Number of ₹ 5 notes =80
Number of ₹ 10 notes =9080=10

Mathematics

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