Question

at practice, diego does twice as many push - ups as noah, and also 40 jumping jacks. he does 62 exercises in total. the equation 2x + 40 = 62 describes this situation. what does the variable x represent?
a) the number of jumping jacks diego does
b) the number of push - ups diego does
c) the number of jumping jacks noah does
d) the number of push - ups noah does

Explanation:

The total exercises Diego does are push-ups plus jumping jacks. The equation $2x + 40 = 62$ has 40 as the fixed jumping jacks, so $2x$ represents his push-ups. Since he does twice as many push-ups as Noah, $x$ must be Noah's push-ups.

Answer:

D) the number of push-ups Noah does