Erina has a bag that starts with 50 marbles in it: 10 green marbles and 40 purple marbles. She wants to increase the ratio of green to purple marbles by adding some more marbles to the bag. Which of the following additions would increase this ratio?

I. 3 green and 1 purple

II. 1 green and 3 purple

III. 3 green and 3 purple

Correct answer marked below

None would increase the ratio

I only

I and II only

I and III only

I, II, and III

Correct

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What this question tests

Your fluency with the order of operations, fractions, decimals, and basic number sense — the foundation every quant question leans on.

Applying the order of operations out of sequence or rounding intermediate values before the final step.