Question

Harita must memorize 90 measures of music for her cello solo at a concert. She plans on memorizing 18 new measures for every 3 days of practice. Which equation can be used to determine m, the number of measures Harita still needs to memorize, as a function of d, the number of days of practice since she began learning the piece?

m = 72 – 15d
m = 90 – 6d
m = 101 – 21d
m = 108 – 3d

Answer 1

m = 90 − 6d

Reason: 18 measures per 3 days = 6 measures per day, so after d days she has memorized 6d measures; remaining measures = 90 − 6d.