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notsponge [240]
3 years ago
14

Every train carriage has 4 doors how many doors will the train have if there are 7 carriages

Mathematics
2 answers:
s2008m [1.1K]3 years ago
5 0

Answer: 28

Step-by-step explanation:

4*7=28

lianna [129]3 years ago
5 0

First write down the unit ratio that is involved.

In this case, it's <em>train carriage/doors</em>.

Next, we set up our proportion.

We know that for every train carriage, there are 4 doors.

So we have 1/4.

We are asked how many doors will there be is there are 7 carriages.

So we have 7/x.

The 7 must go on the top because our unit ratio says

that we must put train carriage/doors.

So we have 1/4 = 7/x.

Solving from here, we use the means-extremes property.

This states that the product of the extremes, (1)(x),

equals the product of the means, (4)(7).

So we have 1x = 28 or just x = 28.

This means that for 7 carriages, there are 28 doors.

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