Add 7.25 l and 875 cl. reduce the result to milliliters.

7500 ml + 8750 ml = 16250 ml

Step-by-step explanation:

The first step is converting everything to mililiters, by rules of three. Then we add.

In a rule of three problem, the first step is identifying the measures and how they are related, if their relationship is direct of inverse.

When the relationship between the measures is direct, as the value of one measure increases, the value of the other measure is going to increase too.

When the relationship between the measures is inverse, as the value of one measure increases, the value of the other measure will decrease.

Unit conversion problems, like this one, is an example of a direct relationship between measures.

First step: 7.25L to ml

Each L has 1000ml. So:

1L - 1000ml

7.5L - x ml

x = 1000*7.5

x = 7500ml

7.25L = 7500ml

Second step: 875cL to ml

Each cL has 10ml. So

1cL - 10ml

875cL - xml

x = 875*10

x = 8750ml

875 cL = 8750 ml

Final step: adding

7500 ml + 8750 ml = 16250 ml

47 - 90 = 43

43 - 180 = x

x = 137

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step-by-step explanation: