Question

A sum of Rs. 800 is in the form of denominations of Rs 10 & Rs 20.If the total no. of notes is 50, find the number of notes of each type.
Write down the steps when u solve it. Thank you

Answer 1

X will be the no. Of 10 rs. Notes
Y will be the no. Of 20 rs. Notes
10x + 20y = 800
x + y = 50
So, 10x + 10y = 500
Now,
10x + 20y = 800
- 10x + 10y = 500
10y = 300
y = 30
x = 20

Answer 2

Answer:

Number of 10rs note = Rs.20

Number of 20rs note= RS.30.

Step-by-step explanation:

Step 1:

Let X will be the no. of 10 rs. Notes

Let Y will be the no. of 20 rs. Notes

Step 2:

Then,

10x + 20y = 800

x + y = 50

Step 3:

Simplify and find the value of x and y.

So, 10x + 10y = 500

Now,

10x + 20y = 800

- 10x + 10y = 500

Step 4:

10y = 300

y = 30

x = 20.