Question

When 2/5 of the koi was given away, there were still b koi and k goldfish left in the pond. How many koi and goldfish were there initially?

Answer 1

Explanation:

Alright, lets get started.

Suppose initially there were x Koi in pool.

`(2)/(5)` of Koi were taken away means, number of fish taken away :
`(2)/(5)x`

So, remaining Koi will be =
`x - (2)/(5)x=(3)/(5)x`

There are still b KOi remaining as per question, so

`(3)/(5)x=b`

So,
`x=(5)/(3)b`

Means initially there were
`(5)/(3)b`Koi.

k goldfish were left in pool.

So number of remaining fish were =
`(5)/(3)b + k`

This is the answer:

Hope it will help :)