5) A grain storage warehouse has a total of 30 bins. Some bins hold 20 tons of grain

12 bins holding 20 tons and 18bins holding 15tons

Step-by-step explanation:

it gives a simultaneous eqn

x + y = 30

20x + 15y = 510

42% acid

Step-by-step explanation:

Suppose that these two storage containers are filled to complete capacity?

That makes the second container have 3 volume parts and the first container having 2 volume parts.

v*(1.50)= (3/2)*v

First Container     2v       30% acid

Second Container    3v       50% acid

The mixture of all of this is in the third container. Two parts plus three parts is 5 parts for the mix volume.

=(2*30+3*50)/5

=210/5

=42

So,

42 % Acid, mixture