368 books are available wednesday
823-312=511
511+129=640
640-272=368
Step-by-step explanation:
Since we have given that
Number of hour Marco practiced the piano on Monday is given by

Number of hours Marco practiced the piano on Tuesday is given by

1) For Adding :
Total number of hours he practiced on both Monday and Tuesday will be

2) For Subtraction,
Number of hour he practiced more on Tuesday than on Monday will be

is it 46 ??? because i did the work and don't feel like explaining
If u add 125 times 8 it will equal 1000
becouse

then

you also can combine it (if this is what are you looking for..)

or any other combination like:

or:
Step-by-step explanation:
please mark me as brainlest