Question

Help please :)

Answer 1

60% solution means 60% of the solution is fertilizer

so how many gallons of fertilizer are in 120 gallons of 60% solution?

Answer 2

i dont know thats why im asking @phi

Answer 3

This is the first step to solving your problem. 60% of the 120 gallons is fertilizer
that can be written as

0.60*120 gal= ?? how many gallons of fertilizer

Answer 4

72

Answer 5

next, the question asks how many gallons of 20% solution should we mix.

We do not know, so we call it x gallons (x for unknown)
how much fertilizer is in x gallons of 20% solution?

Answer 6

.20x?

Answer 7

next, the question asks how many gallons of 80% solution should we mix.

We do not use, so we call it y gallons (x being used up)
how much fertilizer is in y gallons of 80% solution?

Answer 8

*use should be know

Answer 9

.80y?

Answer 10

ok, now if we add up the gallons of fertilizer what does it add up to ? (see your answer to the very first question)

Answer 11

add .20 and .80? o.0

Answer 12

0.20x+ 0.8y = ?? (the amount of fertilizer in 120 gallons of 60% solution)

Answer 13

1

Answer 14

you should get
0.20x + 0.80y= 72

the fertilizer in x gallons of the 20% solution plus the fertilizer in the 80% solution must equal the amount of fertilizer in the 120 gallons.

Answer 15

You cannot ignore the x and the y. 0.20x +0.80y is not 1. We must use the rules of algebra.

now, if we use x gallons of 20% and y gallons of 80% how many gallons do they add up to?
read the question.