TO c)
A barrack has enough provisions to last 200 soldiers for 30 days. How
many soldiers must be transferred elsewhere to last the provisions for 40
days?​

50 soldiers must be transferred elsewhere.

Step-by-step explanation:

We solve this question by proportions, using a rule of three.

As the number of soldiers decrease, the provisions last for more time. This means that the measures are inversely proportional, and we have an inverse rule of three, using line multiplication, instead of cross.

30 days of provisions - 200 soldiers

40 days of provisions - x soldiers

Simplifying by 40

The provisions will last for 40 days with 150 soldiers, which means that 200 - 150 = 50 soldiers must be transferred elsewhere.

explanation:

remove parenthesis:

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apply rule

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multiply fractions:

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divide:

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mordancy.