Question

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

Answer 1

Answer:

Step-by-step explanation:

let the numbers of Rs 10 notes be x and Rs 20 be y

10x+20y=800 ......... (I)

x+y=50 ...... (II)

multiply (I) by 10 we get

10x+10y=500 .... (III)

subtract (III) from (I) we get

10y=300

y=30

x=20

the number of notes of Rs10 is 20 and Rs 20 is 30

Answer 2

Let there be X notes of Rs 10.

Total number of notes = 50.

∴ Number of notes of Rs 20 = (50 – x)

Total sum of money = Rs 800

∴ 10x+ 20 (50 – x) = 800

⇒ 10x+ 1000 – 20x = 800

⇒– 10x = 800 – 1000

⇒ – 10x= – 200

⇒x= 20

∴ 50 – x = 50 – 20= 30

So, there are 20 notes of Rs 10 and 30 notes of Rs 20.