The teacher kept track of how long it took students to finish a test. after 20 minutes, 3 students had finished the test.
how many students were finished after 70 minutes?
a.
7
b.
8
c.
9
d.
10

D. 10 students finished the test.
How I got that:
20 x 4. Which got me 80. (You had to get after 70)
9.5 students finished but round that up to 10.

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8