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Yakvenalex [24]
3 years ago
10

Can anyone pls tell me when do we cross multiply and when do we multiply 10 * 75 im really confused

Mathematics
1 answer:
Westkost [7]3 years ago
4 0

You don't multiply liters of gasoline by distance.

They are<u> directly proportional </u>- the more gasoline you have the longer is the dictance you can go.

So it's <u>cross multiply</u>.

Another examlpe:

you are paid by hour for your work. The more hours you have worked, the more you are paid:

hours      payment

2 h            $36

5 h             x    

x=\dfrac{5\cdot36}2=90

You would multiply 10•70 if they were inversely poportional values

For example:

1. speed and time of ride by given distance {the greater the speed the less time you need for a ride}

speed          time

10 m/s          75 s

 8 m/s           x

x=\dfrac{10\cdot75}{8}=93.75\,s

2. price and kolos of apples - the higher the pice the less of kilos you can buy by given cash

price          kilos of apples

$2                8

$4                x

x=\dfrac{2\cdot8}{4}=4\,kg

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