2 years ago

4. One printing machine printed 1920 books in 40 hours this week. A

Mathematics

1 answer:

Alecsey [184]2 years ago

6 0

2880 books

Divide 1920 by 40
Then multiply the number by 2
You will get 96
Then multiply it by 30

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timama [110]

This can be solved using a system of equations.
$\left \{ {{x+y=80} \atop {x-4y=10} \right. 
$
Subtract y from both sides.
$x=80-y$
Substitute:
$80-y-4y=80-5y=10$
Subtract 80 from both sides:
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Divide both sides by 5:
$y= \frac{70}{5} =14$
Substitute.
$x=80-14=66$

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