A child can eat a candy in 2 minutes.
How many minutes do 100 children need to eat 300 candies?
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1 child ------ 1 candy --------- 2 minutes
'100 children eat 300 candies' means : 1 child will eat 3 candies, so:
1 child -------- 3 candies -------- x minutes
so the equation is :
1 candy ------- 2 minutes
3 candies ----- x minutes
x = (3x2):1 = 6