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Sheila was making place-value disks. She colored 2/6 of the disks red. She colored 1/4 of the disks yellow. If she colored 40 red place value disks, how many disks did she color yellow? How many disks does she still have left to color?

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Answer:

She colored 30 yellow place value disks and 50 disks are left to color.

Explanation:

Let total number of disks be x.

It is given that, she colored 2/6 of the disks red. She colored 1/4 of the disks yellow.


\text{Red disks}=(2)/(6)x


\text{Yellow disks}=(1)/(4)x

She colored 40 red place value disks.


(2)/(6)x=40


(1)/(3)x=40


x=120

It means total number of disks is 120.


\text{Yellow disks}=(1)/(4)x=(1)/(4)(120)=30

So, she colored 30 yellow place value disks.

Remaining disks = Total disks - Red disks - Yellow disks


=120-30-40


=50

Therefore, 50 disks are left to color.

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