Arturo O. answered • 10/11/16

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(a)

Set up a proportion:

80 gallons → 100%

50 gallons → x

x = 50*100 / 80 = 62.5% left; the decrease is 100% - 62.5% =

**37.5%**(b)

Multiply the original 80 gallons by the decimal form of 62.5%, which is 0.625:

0.625*80 = 50 gallons left

The decrease is 80 - 50 = 30 gallons

Set up a proportion:

30 gallons → 80 gallons

x → 100%

x = 30*100 / 80 = 37.5%

The reduction is 37.5%, which is the same as 100% - 62.5%.

(c) Unable to draw pictures in this format.