Ratio, proportion and unitary method.
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Q1 · Ratio and Proportion · EASY
If the ratio of boys to girls in a class is 5:3 and there are 40 students in total, how many girls are there?
Q2 · Ratio and Proportion · HARD
Two numbers are in the ratio 7:9. If 4 is added to each number, the new ratio becomes 5:6. What is the smaller number?