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Addition and Subtraction of Algebraic Expressions

There are 4x ...

Question

There are 4x life jackets and 3y life boats on a ship, and 3x life jackets and 7y life boats on another ship. Which of the following gives the total number of life jackets and life boats on both the ships?

A

7x + 9y

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B

7x + 10y

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C

7x + 7y

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D

4x + 3y

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Solution

The correct option is B 7x + 10y
In the first ship, there are 4x life jackets and 3y life boats.

In the second ship, there are 3x life jackets and 7y life boats.

Adding the two, we get,

4x + 3y + 3x + 7y = 7x + 10y

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