A faraway planet is populated by creatures called Jolos. All Jolos are either green or purple and either one-headed or two-headed.
Balan, who lives on this planet, does a survey and finds that her colony of 140
contains 30 green, one-headed Jolos; 45 purple, two-headed Jolos; and 75
one-headed Jolos.

How many green Jolos are there Balan’s colony?

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-1   1/6.   you dont subtract the denominators

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