Question

Koalas absorb only 25% of the fiber they eat. A koala absorbed 10.5 ounces of fiber in one day. How many ounces of fiber did he eat that day?

Answer 1

42 ounces

Explanation:

So a koala absorbs 25% of fiber they eat.

A koala absorbed 10.5 ounces in a day.

Let x be the amount of ounces of fiber the source(s) actually contained that day.

So we have 25% of x is 10.5

As an equation that is .25x=10.5 or 1/4 *x=10.5.

.25x=10.5

To solve this equation you can divide both sides by .25 giving you

x=10.5/.25=42.

If you chose the other equation which is an equivalent equation you would multiply both sides by 4.

1/4 *x=10.5

x=4(10.5)

x=42

Answer 2

`\huge{\boxed{\text{42 ounces}}}`

25% is equal to
`(1)/(4)`, so multiplying it by 4 gets 100%. This means we can multiply 10.5 by 4 to get 100% of the fiber the koala ate that day.

`10.5*4=\boxed{42}`