Question

A hundred rupee note was changed into 5 rupees and 20 rupees notes .if there are 11 notes in all.find the number of each type of notes?​

Answer 1

Answer:

20 rs note = 3

05 rs note = 8

Step-by-step explanation:

Let the number of 20 rupees note be x and 5 rupees be y

total notes=11

x+y=11 ....................... equation (1)

money from 20 rs note= 20×x

money from 5 rs notes=5×y

total money=100

20x+5y=100 ................... equation (2)

On solving equation 1 and 2 we can find the values of x and y i.e., the no. of notes of each note

x=3

y=8

you can check the answers by putting the values in any of the equation formed above

Answer 2

Answer:

Let there be x five re note and y twenty re note

x+y = 11.....(1)

x×5 + y×20 = 100

x + 4y = 20.....(2)

Subtract (1) from (2)

3y = 20 - 11 = 9

y = 3

x = 11 - 3 =8

Ans 8 five re note and 3 twenty re note