Shelley drives her car for p days over a 30-day period. Her sister Helen used it for 1/6 of the remaining days.
(a) For how long does Helen use the car?
(b) For how long do Shelley and Helen use the car over a 30-day period?
A) 12
B) 21
(a) For how long does Helen use the car?
(b) For how long do Shelley and Helen use the car over a 30-day period?
B) 21