Question

Valerie uses 12 fluid oz of detergent each week for her laundry.if there are 75 fluid oz of detergent in the bottle in how many weeks will she need to buy a new bottle of detergent

Answer 1

Valerie needs to buy a new bottle of detergent after 6 weeks.

Further Explanation

Given:

Valerie uses 12 fluid oz of detergent/week

1 bottle = 75 fluid oz of detergent

Question:

How many weeks will she need to buy a new bottle of detergent?

We need to calculate how long is 1 bottle of detergent will last:

= 1 bottle of detergent : uses/week

= $\boxed {= \frac{75}{12} = 6 \frac{3}{12} = 6 \frac{1}{4} }$

so, one bottle of detergent will last about 6 weeks 1 day, after that she needs to buy a new bottle.

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Keywords: mixed fraction, fraction, division, division big numbers, math word problem

Answer 2

Valerie would need a new bottle in 7 weeks
week 1: 75 -12 = 63 fl oz
2: 63 - 12 = 51
3: 51 - 12 = 39
4: 39 - 12 = 27
5: 27 - 12 = 15
6: 15 - 12 = 3 fl oz
week 7: she only has 3 oz of detergent, so she needs more.