Question

25. A sum of 500 is in the form of denominations of 5 and 10 if the total no of notes is 90 find the number of notes of each type
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Answer 1

Answer:

let no. if Rs 5 notes be 'x' so then no. of Rs 10 notes be (90-x)

Step-by-step explanation:

sum = 500

5x + 10(90-x) = 500

5x +900 - 10x = 500

5x = 400 => x = 80

so Rs 5 notes = x = 80

&Rs 10 notes = 90 - x = 90 -80 = 10

Rs5 notes = 80, Rs10 notes =10 Answer

Answer 2

Let the 5 rupee note be x nos.

IOrupee note y nos

x + y=90. (1)

5x+lOy=500

x+2y=100 (2)

solve (1)&(2)

(2)-(1) >

-y=-IO

y=lO

Put in (i)

x = 80

x = 80 and y=lO

Put this (i)