Question

A sum of Rs 800 is in the form of denominations of Rs 10 and Rs 20. If the total number of notes be 50. Find the number of notes of each type.

Answer 1

Answer:

Step-by-step explanation:

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.

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Answer 2

Answer:

Rs.10 notes are 20 and Rs.20 are 30

Step-by-step explanation:

let the number of 10 notes be x,

then the number of 20 notes be y,

x+y=50

y=50-x........(1)

then the amount will be,

10*x+20(50-x)=800 (from eq. 1)

10x+1000-20x=800

10x-20x=800-1000

-10x=-200

x=20

y=50-x=50-20=30