Question

a man has a certains notes of demonination 20rs and 5rs which amount to 380if the number of notes of each kinds is interchanged they amount to 60rs less as before.find the number of notes in the denomination

Answer 1

Answer:

I hope it is helpful and if helpful mark as brainlist answer

Step-by-step explanation:

Let’s consider the number of 20 rupee notes to be x

And the number of 5 rupee notes be y

Then, according to the given conditions, we have

20x+5y=380 … (i) and

5x+20y=380−60

⇒5x+20y=320 … (ii)

Now, multiplying eq(i) by 4 and subtracting with eq(ii), we get

(80x+20y)−(5x+20y)=1520−320

⇒75x=1200

⇒x=

75

1200

⇒x=16

On substituting the value of x in eq(i), we get

20(16)+5y=380

⇒320+5y=380

⇒5y=380−320=60

⇒y=

5

60

⇒y=12

Therefore,

The number of 20 rupee notes =16 and

The number of 5 rupee notes =12