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miv72 [106K]
3 years ago
12

A contractor estimated that one of his two brick layers would take 9 hours to build a certain wall and the other 10 hours. Howev

er, he knew from experience that when they worked together, 10 fewer bricks were laid per hour. Since he was in a hurry, he put both men on the job and found it took exactly 5 hours to build the wall. How many bricks did the wall contain?
Mathematics
1 answer:
Dmitry [639]3 years ago
6 0

Answer:

900

Step-by-step explanation:

Assume x brick

X*(1/9+1/10)一 10=X/5

X(19/90-1/5)=10

X*(1/90)=10

X=900

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The regular price of a calculator is $49.95 before taxes. It goes on sale at 20% below the regular price. Before taxes are added
Kay [80]

Answer:

$39.96

Step-by-step explanation:

Since it is 20% off, we would multiply by .8, as we subtract the .2 (20%) off of the price.

$49.95 x 0.8 = $39.96

6 0
3 years ago
Bridgette made a graph of her neighborhood on a coordinate grid. The points A(-2, 3), B(-2, -2), C(2, -2), and D(2, 3) represent
vodka [1.7K]

Answer:

\boxed{\text{18 blocks}}

Step-by-step explanation:

Distance travelled on graph = AB + BC + CD + DA  

AB = CD  = (3 +2) = 5

BC = AD = 2 –(-2) = 4

Distance on graph = 2 × 5 + 2 × 4 = 10 + 8 = 18 spaces = 18 blocks

Bridgette jogs \boxed{\textbf{18 blocks}}each day.

8 0
3 years ago
Sally works 40 hours a week and makes $20 an hour, but her kids are in child care each day and the day care center charges her $
Maslowich

Answer:

$11.25

Step-by-step explanation:

Multiply the number of hours she works by how much she gets paid per hour.

800

Multiply 50 times 7 (50 being the amount charged for her kid and 7 being the days of the week)

350

Subtract the 350 from the 800

450

Divide the 450 by the number of hours worked per week

450/40

Answer: 11.25

So Sally actually makes 11.25 per hour.

5 0
3 years ago
PLEASE HELP ASAP! I NEED TO PASS THIS TEST!
Nataly [62]
X^2+20x+10 that's the answer
4 0
3 years ago
The runner has run 5.6 miles which is 35% of today's course How long is today's course? Show another correct answer other than 5
katrin [286]

Answer:

the answer is 16 miles

Step-by-step explanation:

5.6 divided by 3.5 and then multiplyed by 135 persent use a calculater

8 0
3 years ago
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