Question

For each of the following questions, choose the correct answer.

Elena has bought 320 tropical fish for a museum display. She bought 7 times as many triggerfish as parrotfish. How many of each type of fish did she buy?

280 parrotfish, 40 triggerfish
20 parrotfish, 140 triggerfish
120 parrotfish, 200 triggerfish
40 parrotfish, 280 triggerfish

Answer 1

p + t = 320
7p = t
now sub 7p in for t in the first equation
p + 7p = 320
8p = 320
p = 40
now sub 40 in for p
7p = t
7(40) = t
280 = t

answer is the last one