If 75% of the students in a school are boys and the number of girls is 420, the number of boys is:

Answer: Option C

No. of boys = 75%
No. Girls = 25% = 420
Now comparing,
25% = 420
1% = $$\frac{420}{25}$$
So, 75% = $$\frac{420\times 75}{25}$$  = 1260
No. of boys = 1260