Question

The sum of the cost of 1kg apple and 1kg pine-apple is Rs.150 and the cost of 1 kg apple is twice the cost of 1kg pine-apple.Obtain a pair of linear equation in two variables from the given information.

Answer 1

Let 1kg of pine-apple be x
Then cost of of 1kg of apple is 2x

x + 2x = 150
3x = 150
x = 150/3
x = 50

Cost of 1kg pine-apple is x
=₹50
Cos of 1kg apple is 2x
=₹100

Answer 2

Solution :

Let the cost of 1kg apple = Rsx

cost of 1kg pine-apples = Rsy

According to the problem given,.

x + y = Rs 150 ---( 1 )

and

cost of 1kg apple is twice the cost

of 1kg pine-apples.

x = 2y ---( 2 )

Therefore ,

Required pair of linear equations in

two variables are ,

x + y = 150 ---( 1 )

x = 2y -----( 2 )

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