Question

Melanie needs to mix a 10% fungicide solution with a 60% fungicide solution to create 100 millileters of a 25% solution. How many millileters of each solution must Melanie use?

Answer 1

`70` ml of `10%` of fungicide solution to be mixed with
`30` ml of `60%` of fungicide solution to get `100` ml
of `25%` of fungicide solution.

Explanation:

Let `x` ml of `10%` of fungicide solution is mixed with

`100-x` ml of `60%` of fungicide solution to get `100` ml

of `25%` of fungicide solution. Therefore, balancing we get,

`10/100 x+ 60/100 (100-x) = 25/100 *100` or

`10 x+ 60(100-x) = 25 *100` or

`10 x+ 6000- 60 x = 2500` or

`-50 x = 2500-6000 or -50 x= -3500`

`:. x= -3500/-50 or x= 70 :. 100-x= 30`

Hence `70` ml of `10%` of fungicide solution to be mixed with

`30` ml of `60%` of fungicide solution to get `100` ml

of `25%` of fungicide solution. [Ans]