Question

A sum of ₹600 is in the form of denomonation of ₹5 and ₹10 if the total number of notes is 80 find the number of notes of each type​

Answer 1

Answer:

let the notes of ₹5 be x and ₹10 be y

from 1st condition

5x+10y=600........................(1)

from 2nd condition

x+y= 80.........,.................,........(2)

multiply eq (2) by 5

5x+5y=400.............................(3)

subtracting eq (3) by (1)

5x+10y=600

- 5x+5y=400

(-) (-) (-)

---------------------------

5y = 200

y = 200/5

y = 40

substituting y in eq (2)

x+y = 80

x + 40 = 80

x = 80 - 40

x = 40

therefore the number of ₹ 5 notes is 40 and ₹ 10 is 40