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Rob is a high school student taking both algebra and geometry. Last night he had 27 homework problems combined from the two classes, and he took a total of 90 minutes to do them. If each algebra problem took him 2 minutes and each geometry problem took him 5 minutes, how many algebra problems did he have for homework?

Respuesta :

jgonzales0096

Answer:

The answer is D

Explanation:

The number of  algebra problems did he have for homework is 15.

  • The calculation is as follows:

Here we assume x represent the number of algebra problems. So,  the number of geometry problems was 27-x and the total working time was ...

 2x +5(27 -x) = 90

 -3x = 90 -135

-3x = -45

x = 15

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