Question

What quantity of milk at Rs 28/litre be mixed with 15 litres of milk at Rs 34/litre so that 20% profit

is earned by selling the mixture at Rs36/litre?​

Answer 1

Step-by-step explanation:

Suppose a container contains

x

units of a liquid from which

y

units are taken out and replaced by water. After

n

operations, quantity of pure liquid

=

x

(

1

−

y

x

)

n

units.

milk contained by the container now

=

40

(

1

−

4

40

)

3

=

40

(

1

−

1

10

)

3

=

40

×

9

10

×

9

10

×

9

10

=

4

×

9

×

9

×

9

100

=

29.16