Q: The ratio of the number of boys to the number of girls in a class is 2:5. If 10 boys leave the class and 20 new girls join the class, then the new ratio of boys and girls in the class becomes 4:25. What is the number of boys in the class now?
A.
22
B.
12
C.
9
D.
8
Correct Answer:
Option B -
Explanations:
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