Question

Anouk has two dispensers that can each hold 1.25 liters. She fills them with liquid hand soap from a store that charges $0.19 for every 50 milliliters of soap.

How much does it cost Anouk to fill both of her dispensers with hand soap?


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Answer 1

$4.75

Explanation:

1milliliter = 1mL = 1.0*10^-3L

50mL = 50*10^-3L = 0.05L.

But 0.05L costs $0.19 to refill,

How much will 1.25L cost?

0.05L = 0.19

1.25 = x

X = (1.25*0.19) / 0.05

X = $4.75

It will cost her $4.75 to refill 1.25L of soap

Answer 2

$9.5

Explanation:

Each dispenser holds 1.25 liters, so we have a total of 1.25*2 = 2.5 liters to be filled.

Each 50 milliliters of soap, that is, 0.05 liters, costs $0.19, so we can solve now using a rule of three:

0.05 liters of soap -> $0.19

2.5 liters of soap -> X

0.05/2.5 = 0.19/X

X = 2.5*0.19/0.05 = $9.5

It will cost $9.5 to fill both dispensers with soap.