A biology teacher has 15 milliliters of a salt solution that is 65% salt. How many milliliters of water must the teacher add to

Question

Yakvenalex [24]

2 years ago

11

A biology teacher has 15 milliliters of a salt solution that is 65% salt. How many milliliters of water must the teacher add to

make a solution that is 25% salt?

Mathematics

1 answer:

My name is Ann [436] · Answer 1 · 2022-07-06T10:55:39+03:00

My name is Ann [436]2 years ago

7 0

Assuming that water has 0% salt and that the amount of water added is x ml;

(15+x)*25 = (15+0)*65 = 975
375+25x = 975
25x = 975-375 = 600
x = 600/25 = 24 ml

The teacher must add 24 ml of water.