Writing and solving equations

The number of green balls is g. The number of red balls is 3 more than the number of green balls, and the number of blue balls is 7 more that the number of green balls. If the number of blue balls is 18, how many green balls are there?

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1. Just translate the English to Math, after all, Math is just a language.

let the number of green balls be g , as suggested

"The number of red balls is 3 more than the number of green balls" ---> reds = g+3

"the number of blue balls is 7 more that the number of green balls" --> blue = g + 7

"the number of blue balls is 18" ---> g+7 = 18
g = 11

There are 11 greens

(Where do the red balls come in ??)

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posted by Reiny

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