## anonymous one year ago Kelsey painted one-fourth of her bedroom in three-sevenths of an hour. At this rate, how long would it take her to paint the entire room

1. jim_thompson5910

We have this ratio $\Large \frac{1}{4} \ \text{bedroom} \ : \ \frac{3}{7} \ \text{hour}$ Multiply both parts by 4 to turn the "1/4" into "4/4" which is just 1 $\Large {\color{red}{4*}}\frac{1}{4} \ \text{bedroom} \ : \ {\color{red}{4*}}\frac{3}{7} \ \text{hour}$ $\Large \frac{4}{4} \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}$ $\Large 1 \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}$

2. jim_thompson5910

12/7 = 1.714 approximately it takes roughly 1.714 hours to paint the whole room

3. anonymous

thanks

4. jim_thompson5910

no problem

5. anonymous

Margie calculated that she would spend $175 on school supplies this year. She actually spent$97.50 on school supplies. What is Margie’s percent of error

6. anonymous

77.3% 79.5% 44.2% 4.4%

7. jim_thompson5910

8. anonymous

i get 72.5

9. jim_thompson5910

Did you use the formula $\Large \frac{|\text{Approximate Value} - \text{Actual Value}|}{| \text{Actual Value}|}\times 100\%$ they show it on the page

10. anonymous

oh no i didnt

11. jim_thompson5910

They also posted this How to Calculate Here is the way to calculate a percentage error: Step 1: Calculate the error (subtract one value form the other) ignore any minus sign. Step 2: Divide the error by the exact value (we get a decimal number) Step 3: Convert that to a percentage (by multiplying by 100 and adding a "%" sign)

12. anonymous

whats the approximate value

13. anonymous

nvm

14. jim_thompson5910

it's the estimate

15. anonymous

i couldnt find the answer can you tell me ill give you a medal

16. jim_thompson5910

approximate = 175 (this is the amount she estimates) actual = 97.50 (actual amount she spends)

17. jim_thompson5910

does that help?