A punch recipe calls for a lemonade to soda ratio of 2:6. If there are 160 gallons of punch, how many gallons of lemonade were used?
4

80

40

OR

20

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

Do the inverse operation

You should use a calculator for this.