Question

a sum of Rs 800 is in the form of denominations of Rs 10 and Rs 20 if the total number of notes is 50 find the number of notes of each type​

Answer 1

Answer:

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

$\huge{\boxed{\tt{Solution:-}}}$

Let the no. of Rs. 10 be x

Let the no. of Rs.20 be 50-x

10x + 20 (50-x)= 800

10x + 1000-20x = 800

-10x = 800 - 1000

-10x = -200

x = $\frac{-200}{10}$

$\boxed{x = 20}$

No. of 10 notes be 20

No. of 20 notes be 50-x

• 50-20

=30