Practice30Create account

In a class the number of boys is 40% of the number of girls. If the class has 70 students in all, how many girls are in the class?

Competition practicePercentage
  • A28
  • B42
  • C20
  • D50

Step-by-Step Solution

Let there be G girls; then the boys number 0.4G, and G + 0.4G = 1.4G = 70, so G = 50 (with 20 boys). Check: 20 is 40% of 50, and 50 + 20 = 70. 28 is 40% of 70 and 42 is the other 60% - both read the 40% as a share of the CLASS, but the question makes it a share of the GIRLS. 20 is the number of boys.
Answer: D) 50

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Percentage practice questions

More Percentage practice

A museum had 25% more visitors on Sunday than on Saturday, and on Monday it had 40%…The count of landline telephone connections in a town falls by 20% every year. If the…A cricket team's total of 320 runs came from four batters who made 96, 84, 76 and 64…In a warehouse, the number of cartons on the second floor is 80% of the number on the…A distributor keeps 50% of a consignment in his main godown, 40% of the main godown's…