Question

1. 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 denomination.​

Answer 1

Answer:

Let the number of ₹ 5 notes = x

∴ The number of ₹10 notes = 90-x

Value of ₹ 5 notes= x \times×₹5 = ₹ 5x

an the value of ₹10 notes = (90-x)\times×₹10 = ₹(900-10x)

∴Total value of all the notes = ₹500

∴5x+(900-10x)=500∴5x+(900−10x)=500

⇒5x+900-10x=500⇒5x+900−10x=500

⇒-5x=500-900⇒−5x=500−900

⇒-5x=-400⇒−5x=−400

⇒x=\frac{-400}{-5}⇒x=  

−5

−400

​  

 

⇒x=80⇒x=80

∴ The number of ₹ 5 notes = x = 80 and

The number of ₹ 10 notes = 90-x = 90-80 = 10 .

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Answer 2

Answer:

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