Question

1. A sum of 500 is in the form of notes of denominations of 5 and 10. If the total number of notes is 90 then find the number of notes of each type.​

Answer 1

Answer:

Step-by-step explanation:

A sum of ₹ 500 is in the form of notes of denominations of ₹ 5 and₹ 10. If the total number of notes is 90, find the number of notes of each type. The number of ₹ 10 notes = 90-x = 90-80 = 10 .

Answer 2

Step-by-step explanation:

let no. of notes of 10 be x and of 5 be y

by 1stcondition

10x + 5y = 500

by 2nd condition

x + y = 90

multiplying second equation by 5

5x + 5y = 450

subtracting EQ 3 from EQ 1

10x + 5y = 500

-. 5x + 5y = 450

=. 5x + 0. = 50

so, x = 50/5 = 10

substitute x = 10 in EQ 2

10 + y = 90

y = 90-10

y = 80

ans - there are 10 notes of ₹10 and 80 notes of ₹5

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