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aalyn [17]
3 years ago
15

Solve: 5(x 9) – 23 = 42 a. 4 b. 5 c. –4 d. 16

Mathematics
1 answer:
Inessa [10]3 years ago
5 0
You missed an operand in the set of parentheses...if it was (x-9) we have:

5(x-9)-23=42  do multiplication indicated on left side...

5x-45-23=42  sum up like terms on left...

5x-68=42  add 68 to both sides

5x=110 divide both sides by 5

x=22  since this answer isn't in your choices the parentheses must have contained (x+9)...uggh :)

5(x+9)-23=42  perform indicated multiplication on left side...

5x+45-23=42  combine like terms on left side...

5x+22=42 subtract 22 from both sides

5x=20 divide both sides by 5

x=4
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Five men working six hours a day take eight days to fill a trench. How long does it take 3 men working eight hours a day to fill
Oduvanchick [21]

Answer:

The correct answer is 10 days.

Step-by-step explanation:

To fill a trench, 5 men work for 6 hours a day for eight days.

Total work hours required is given by 5 × 6 × 8 = 240 hours.

The same work is supposed to be done by 3 men working 8 hours a day.

Let these three men need to work for x days.

Therefore total work hour these group of three men gave = 3 × 8 × x = 24x hours

Therefore the work hour of both the group of 5 men and 3 men should be equal.

⇒ 24x = 240

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