Word problem

Question

a classroom has an equal number of boys and girls (eleven) eleven girls left to play badminton, leaving twice as many boys as girls in the classroom what was the original number of pupils present?

Answer 1

#g=#b

g-11 (11 girls left)

b=2(g-11)

substitute

g=2g-22  (b=g)

g-2g=-22

-g=-22

g=22

b=22

there are 22 boys and 22 girls for a total of 44 students