Answer:
On Monday, Marco practiced the piano for 7/10 hour. On Tuesday he practiced for 11/6 hour. To find out how many hours he practiced in total for these two days, we need to add these two amounts together.
We can add these two amounts together by converting them to a common denominator, in this case 24:
7/10 hour = (7/10) * (24/6) = 724/60 = 72/5 = 14/5 hour
11/6 hour = (11/6) * (24/6) = 114/6 = 112/3 = 22/3 hour
So the total number of hours he practiced for these two days is (14/5) + (22/3) = (14+44)/(5*3) = 58/15 hour
He is supposed to practice 5/4 hours each day. To find out how many hours he is still supposed to practice, we have to subtract the total number of hours he practiced from the total number of hours he is supposed to practice per day:
5/4 hour - 58/15 hour = (53)/(43) - (58/15) = 15/12 - 58/15 = (180-58) / (12*15) = 122/180 hour or 0.67 hour
So Marco is supposed to practice 0.67 hour more to meet his daily practice goal.
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