Question

Laura is bowling 5 games. Her first 4 scores were 103, 138, 143, and 149.

To end up with an average score of at least 142.4, what is the lowest score Laura will need in the fifth game?
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Answer 1

179

Explanation:

x/5=142.4

142.4*5=712

712-103-138-143-149=179

double check: 179+103+138+143+149=712

712/5=142.4

Answer 2

Answer: 179

Explanation:

make an inequality (103+138+143+149+x)/5 ≥ 142.4

then you solve the inequality

533+x ≥ 712

x ≥ 179 so the lowest score Laura will need is 179