Question

A sum of 800 is in the form of of denomination of rs 10 and rs 20. If the total no.of notes be 50 find the no.of notes of each type​

Answer 1

Answer:

x=20 and y=30

Step-by-step explanation:

Let the number of rs 10 notes be x and rs 20 notes be y.

==> The total amount of money is rs 800 comprising only rs 10 and rs 20 notes.

==> 10x+20y=800-----> (i)

==> The total number of notes is 50

==> x+y=50-----> (ii)

Dividing (i) by 10 on both sides:

==> x+2y=80-----> (iii)

Subtracting (ii) from (iii):

==> x+2y-x-y=80-50

==> y=30

Substituting in (ii),

==> x+30=50

==> x= 20

Therefore the number of rs 10 notes is 20 and rs 20 notes is 30.

Hope it helps!!

Please mark as brainliest!!