Question

If sea water contains 3.5% of salt. How much seawater do you need in order to get 17.5 lb of salt?

Answer 1

500 lb

Explanation:

Let x lb be the weight of seawater needed to get 17.5 lb of salt.

Now,

x lb - 100%

17.5 lb - 3.5%

Write a proportion:

`(x)/(17.5)=(100)/(3.5)`

Cross multiply:

`x\cdot 3.5=100\cdot 17.5\\ \\x=(100\cdot 17.5)/(3.5)=500\ lb`