Billy was counting the number of wheels and bike seats at the playground. He saw tricycles and bicycles. He counted 79 wheels an
d 28 seats.How many bicycles did Billy see?
1 answer:
Let t = # of tricycles; let b = # of bikes.
# of trike wheels is 3t; # of bike wheels is 2b. Total number of wheels is 79, which equals 3t + 2b. t+b = 28, so t=28-b.
Subst. 28-b for t in the first equation:
3(28-b) + 2b = 79. Then 84-3b + 2b = 79, or 5 = b (answer)
There were (28-5) = 23 trikes, 5 bikes, and 28 seats.
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