Algebra systems

Question

A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is
70%
salt and Solution B is
95%
salt. She wants to obtain
40
ounces of a mixture that is
85%
salt. How many ounces of each solution should she use?

Answer 1

s represents the amount of 95%

40 - s represents the amount of 70%

0.95s + 0.7(40 - s) = 0.85(40)

 

Can you solve for s and answer?