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k0ka [10]
3 years ago
9

A new photocopier works 4 times as fast as an old one. When the machines work together, a university can produce all its staff m

anuals in 28 hours. Find the time it would take each machine, working online, to complete the job.
Mathematics
1 answer:
Usimov [2.4K]3 years ago
6 0

The old photocopier can make x manuals in an hour. The new photocopier can make 4x. Combined, they made 5x manuals in an hour.

In one hour they can make 1/28 of the manuals.

1/(28*5)=1/140 is the rate.

The new photocopier can make all the manuals in 4/140 or 35 hours.

The old one can make them in 140 hours.

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Read 2 more answers
Explain how to compute 3/4 x 4/5 using one diagram.
Drupady [299]

Answer:

The simplified form of given expression is 3/5.

Step-by-step explanation:

The given expression is

\frac{3}{4}\times \frac{4}{5}

We need to find the product of two factions using diagram.

For 3/4, draw a box and divide it in 4 equal parts by using vertical lines. The  color three parts of it.

For 4/5, draw a box and divide it in 5 equal parts by using horizontal lines. Then color the four parts of it.

Now combined both boxes and shown below.

From the below figure it is clear that

The number of common shaded small boxes =  12

Total number of small boxes = 20

The required fraction is

Fraction=\frac{\text{Number of common shaded small boxes}}{\text{Total number of small boxes}}

Fraction=\frac{12}{20}

Cancel out common factor.

Fraction=\frac{3}{5}

Therefore, the simplified form of given expression is 3/5.

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mr Goodwill [35]
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1. What is the value of x? Show all of your work.
pishuonlain [190]
Pythagorean Theorem: A^2 + B^2 = C^2 
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<span>C^2 - A^2 = B^2 </span>
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