Question

Aruna has only 1 and 2 coins with her.if the total number of coins that she has is 50 and the amount of money with her is 75,then find number of 1 and 2 coins

Answer 1

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Let the number of 1 coins with aruna be x
let the number of 2 coins with aruna be y

now, according to the question,

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

also it is given that the total amount of money with her is 75
so,

x + 2y = 75 ............... ( B )

subtracting ( A ) from ( B ), we get

x + 2y = 75
- x - y = - 50
___________
y = 15 { put in equation ( A ) }
--------------------

x + 15 = 50

x = 50 - 15

x = 35

Hence we come to the conclusion that,
number of 1 coins with aruna = x = 35
number of 2 coins with aruna = y = 15

Answer 2

Answer:

Let the number of 1 coins with aruna be x

let the number of 2 coins with aruna be y

now, according to the question,

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

also it is given that the total amount of money with her is 75

so,

x + 2y = 75 ............... ( B )

subtracting ( A ) from ( B ), we get

x + 2y = 75

- x - y = - 50

___________

y = 15 { put in equation ( A ) }

--------------------

x + 15 = 50

x = 50 - 15

x = 35

Hence we come to the conclusion that,

number of 1 coins with aruna = x = 35

number of 2 coins with aruna = y = 15