Question

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?

Answer 1

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.