Question

a sum of 500 rupees is in the form of denominations of 5 rupees and 10 rupees if the total number of notes is 90 find the number of notes of each type​

Answer 1

hey mate!

Let the number of Rs 5 notes be x Hence the number of Rs 10 notes be (90 − x) Total sum of money = Rs 500 ∴ 5x + 10 (90 − x) = 500 5x + 900 − 10x = 500 − 5x = 500 − 900 = −400 ∴ x = 80 Hence there are 80 notes of Rs 5 and 10 notes of Rs 10.

Answer 2

let the numbers of rs.5 be X.

and the numbers of rs.10 be y.

a/q

X+y=90 ...eqn(1)

5x+10y=500 ...eqn(2)

X+y=90. × 10

5x+10y =500. ×1

10x+10y=900

5x+10y=500

subtracting eqn (1)and (2)

we get

X= 80

put the value of X in eqn (1)

80+y=90

we get

y=10

X=80 , y = 10

check

5×80+10×10=400+100=500

10+80=90

mark me as brain list