Question

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

Answer 1

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
\[\Large {\color{red}{4*}}\frac{1}{4} \ \text{bedroom} \ : \ {\color{red}{4*}}\frac{3}{7} \ \text{hour}\]
\[\Large \frac{4}{4} \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}\]
\[\Large 1 \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}\]

Answer 2

12/7 = 1.714 approximately

it takes roughly 1.714 hours to paint the whole room

Answer 3

thanks

Answer 4

no problem

Answer 5

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

Answer 6

77.3%
79.5%
44.2%
4.4%

Answer 7

have a look at this page

https://www.mathsisfun.com/numbers/percentage-error.html

Answer 8

i get 72.5

Answer 9

Did you use the formula

\[\Large \frac{|\text{Approximate Value} - \text{Actual Value}|}{| \text{Actual Value}|}\times 100\%\]

they show it on the page

Answer 10

oh no i didnt

Answer 11

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)

Answer 12

whats the approximate value

Answer 13

nvm

Answer 14

it's the estimate

Answer 15

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

Answer 16

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

Answer 17

does that help?