math help!!!!!!!!?

Question

mr.stoddard recycles 85% of all his garbage. how many gallons did he recycle this month if his total amount of garbage was 25 gallons.
can you show me the cross product method and ratio method for this problem
Please =)

Answer 1

The ratio is set up as follows, where x is the number of recycled gallons out of 25:

x/25 = 85/100

Cross-multiply:

x*100 = 25*85
100x = 2,125
x = 2125/100
x = 21.25

The answer is 21.25 or 21 1/4 gallons.

Answer 2

Percentages are really just fractions, where 100 is the denominator. For example, 40% is 40/100.

So, for this problem, the total amount of garbage is 25 gallons. The fraction version of the percentage, that is, 85/100, can be written like so:

85 = y
100 25

I put y as the amount we want to find. And y is a fraction of 25 gallons, just like 85 gallons would be an equivalent fraction of 100 gallons.

So, let's cross multiply. You multiply the 85 by 25, and the 100 by the unknown. Like so:

85 x 25 = 100 x y

2125 = 100y

You can divide both sides by 100, to isolate the y.

2125/100 = y

Dividing, we get the answer.

y = 21.25 gallons.

Mr. Stoddard recycled 21.25 gallons of garbage. I hope that helps!

Answer 3

The cross product method

x/25=85/100

100x = 25 x 85

100x = 2125

x = 21.25 gallons

Answer 4

u do not need cross product for this, it is simple percentage question,
find 85% of 25 gallons
that is
85 * 25 /100 = 21.25 gallons

Answer 5

What is 85% of 25? -->

0.85 x 25 = 21.25 gallons

Couldn't help it, just gave you the multiplication method.

Answer 6

85%of 85 gallons=0.85x25=21..25gallonsanser

Answer 7

85% of 25
=21.5

Answer 8

.......................%|.Actual
Recycyles....85.. |....x
Doesn't........15...|
Total.............100 |.. 25 gal

Find 'x' by multiplying 85 and 25. Then divide that number by 100, if I'm not mistaken.

Answer 9

25=100%
__ ____
X =85

100X=2125
X = 21.25 gal