Answer:

25% of the pupils are girls.

25%

10 is 25% of 40

Step-by-step explanation:

10 is what percent of 40?

10 is P% of 40

Equation: Y = P% * X

Solving our equation for P

P% = Y/X

P% = 10/40

p = 0.25

Convert decimal to percent:

P% = 0.25 * 100 = 25%