Marvin spent 3.4 hours which is 40% of his time at the recreational center playing ping pong. How long was Marvin at the recreational center?

Marvin spent 10 hrs 12 min at the recreational center.

or 10.2 hrs

Step-by-step explanation:

3.4 hrs = 40% of x

3.4*2 = 80% of x

6.8 = 80% of x

6.8 + (1/2 * 6.8) = 100%

6.8 + 3.4 = 100%

10.2 = 100%

= 8.5 hours

= 8 hours 30 minutes

Step-by-step explanation:

Full time spent = 100%

If 40% = 3.4 hours,

What about 100% = ?

= (100 x 3.4) : 40

= 340 : 40

= 8.5 hours