Question

A sum of Rs.500 is in the form of denomination of Rs.10 and Rs.20. Of the total no. of notes be 50, find the no. of each type of note​

Answer 1

Answer:

Let the no. of 10 rupees note be x

Let the no. of 20 rupees note be y

Step-by-step explanation:

10x + 20y = 500

10(x + 2y)=500

x + 2y = 50___________1

x+y=50______________2

subtract 1 and 2

x+2y=50

x+y=50

y=0

put in 1

x=50

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Answer 2

Answer:

Let the number of Rs.10 notes be x.

Number of Rs.20 notes = 50 - x

According to Question,

10x + 20 (50 - x) = 500

=> 10x + 1000 - 20x = 500

=> 1000 - 10x = 500

=> 1000 - 500 = 10x

=> 10x = 500

=> x = 500/10

=> x = 50

Hence, number of Rs.10 notes = 50

There are no Rs.20 notes.