Judy spent 1 hour 15 minutes less than sandy exercising last week sandy spent 50 minutes less than Mary who spent 3 hours at the gym how long did Judy spend exercising

Judy spent 55 mins at gym.

Step-by-step explanation:

Let the time spent by Judy be 'J'

Let the time spent by Sandy be 's'

Mary spent 3 hours at gym.

Sandy spent 50 mins less than Mary

S = 3hours - 50 mins

S = 2 hours 10 mins

Judy spent 1 hour 15 mins less than Sandy.

J = S - 1hour 15 mins

J = 2 hours 10 mins - 1 hour 15 mins

J = 55 mins

Judy spent 55 mins at gym.