If it takes 12 students 50 minutes to inflate 200 helium balloons, how long will it take 7 students working at the same rate (to the nearest minutes)?
if it takes 12 people 50 minutes, then it would take one person 50 times longer:
50 × 12 = 600 minutes
600 ÷ 7 = 85.7 minutes (this will be 7 times quicker)
= 86 minutes