Amaiya purchased a box of 36 pencils to donate to Ms. Annunziata’s class, but not all pencils were used. The ratio of pencils th

Question

3 years ago

8

at were used to the pencils that did not use is 7 to 5. How many pencils were left from the box of pencils Amaiya bought?

1 answer:

deff fn [24] · Answer 1 · 2022-03-10T19:50:47+03:00

15 pencils were left from the box of pencils Amaiya bought.

Step-by-step explanation:

Number of pencils in box = 36

Ratio of used pencils to not used = 7:5

Let,

7x be the total pencils used.

5x be the total pencils not used.

Therefore,

7x+5x=36

$12x=36$

Dividing both sides by 12;

$\frac{12x}{12}=\frac{36}{12}\\x=3$

Therefore,

Used pencils = 7x = 7*3 = 21

Not used pencils = 5x = 5*3 = 15

15 pencils were left from the box of pencils Amaiya bought.

Keywords: ratio, multiplication

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