subtracting fraction from a whole number

Question

there are 90 grade 3 pupils who joined the fieldtrip. one-third of the pupils wore P.E. uniforms while the rest wore their school uniforms. how many pupils wore thier P.E. uniforms?

Answer 1

there are 90 pupils,who went for the trip.

1/3 wore their PE wear meaning 2/3 wore school uniform

To get the actual number of pupls that wore their PE wear, we will say 1/3 of 90

90/3=30.