Answer :
Teri used 130 red bands on the 1st bracelet
Step-by-step explanation:
Teri bought 360 rubber band to make a bracelet
- 15% of the bands were white and the rest were red
- After using 140 bands to make her 1st bracelet , 20% of the remaining bands were white
We need to find how many red bands did Teri use on the 1st bracelet
∵ Teri bought 360 rubber bands
∵ 15% of the bands were white
- Find the number of white bands by multiplying 155 by 360
∴ The number of the white bands = 15% × 360
∵ 155 = 15 ÷ 100 = 0.15
∴ The number of the white bands = 0.15 × 360 = 54
∵ She used 140 bands to make the first bracelet
∴ The remaining band = 360 - 140 = 220
∵ 20% of the remaining bands were white
- Find the number remaining white bands by multiplying 20% by 220
∴ The number of remaining white bands = 20% × 220
∵ 20% = 20 ÷ 100 = 0.2
∴ The number of remaining white bands = 0.2 × 220 = 44
- Subtract 44 from 54 to find the number of white bands used
in the 1st bracelet
∴ The number of white bands in the 1st bracelet = 54 - 44 = 10
∵ The number of bands in the 1st bracelet is 140
∵ 10 of them were white
∴ The number of red bands in the 1st bracelet = 140 - 10 = 130
Teri used 130 red bands on the 1st bracelet
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