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Answer: She had 27.2% correct.
Step-by-step explanation: To find the percent, we can divide the part and whole then multiply the quotient by 100. After that we'll need to convert the percent to a decimal. In mathematical terms, the formula will be,
40% will be the part and 68% will be the whole.
<u><em>Step 1.</em></u>
Convert 40 into a decimal by dividing it by 100.
40 ÷ 100 = 0.4
<u><em>Step 2.</em></u>
Multiply 0.4 by 68.
0.4 × 68 = 27.2
Hence, she had 27.2% correct.
Answer:
The new carpet will cost $1279.13 to the nearest cent
Step-by-step explanation:
The given is:
1. Sarah used a scale of inch = 3 feet
2. On the drawing, a rectangular room measures inches
by inches
3. Sarah wants to purchase new carpet for the room that costs $3.79
per square foot
We need to find much the new carpet will cost
∵ The scale is 0.5 inch = 3 feet
∵ The dimensions of the room on the drawing are inches and
inches
∵ = 2.5
∵ = 3.75
Use the ratio method
→ inches : feet
→ 0.5 : 3
→ 2.5 : x
→ 3.75 : y
- By using cross multiplication
∴ 0.5 x = 2.5 × 3
∴ 0.5 x = 7.5
- Divide both sides by 0.5
∴ x = 15 feet
∴ 0.5 y = 3.75 × 3
∴ 0.5 y = 11.25
- Divide both sides by 0.5
∴ y = 22.5 feet
∴ The actual dimensions of the room are 15 feet and 22.5 feet
Now lets find the area of the room which is the area of the carpet
∵ Area of the carpet = 15 × 22.5
∴ Area of the carpet = 337.5 feet²
∵ The cost of the carpet is $3.79 per square feet
∴ The cost of the carpet = 3.79 × 337.5 = 1278.125
∴ The cost of the carpet = $1279.13 to the nearest cent
The new carpet will cost $1279.13 to the nearest cent
Learn more:
You can learn more about ratio in brainly.com/question/13076219
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