Mr. Kole has 30 students in his class. He has twice as many girls as boys. What is the ratio of boys to total students?

Let the number of boys be b. Then there are 2b girls, so 3b = 30 and b = 10. The ratio of boys to all students is 10:30, which simplifies to 1:3, so the correct choice is A) 1:3.

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