It's hard to tell what formula you mean from your description, but I think you mean
4 times 3 divided by 4 plus 10 times 5 over 12.
Normally multiplication and division is performed before addition so this equals
(4 * 3 / 4) + (10 * 5 / 12)
4 times 3 divided by 4 equals
12 divided by 4 equals
3
and on the other side of the plus
10 times 5 divided by 12 equals
50 divided by 12
50 doesn't go exactly into 12 but we can make it equal
25 over 6
to add the results we need to evaluate
3 plus (25 over 6)
to do this, we have to use a lowest common denominator, in this case 6
3 plus (25 over 6) equals
3 * 6 over 6 plus (25 over 6) equals
(18 over 6) plus (25 over 6) equals
(18 + 25) over 6
43 over 6
43 over 6 is a vulgar fraction, so we extract as many whole numbers as possible
43 over 6 equals
42 over 6 plus 1 over 6
equals:
7 plus 1 over 6
7 1/6
10/12 + 8/12 = 18/12 or 1 and 6/12 or 3/2 or 1.5
3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 17/12
10 + 12/3 + 20 = 34
(5/6) + (3/4) = (10/12) + (9/12) = 19/12 = 1 and 7/12
3/4 + 5/6 = 9/12 + 10/12 = 19/12 or 1 and 7/12
11/3 is.
10/12
6/12 = 1/2 = 5/10 so 6/12 + 3/10 = 5/10 + 3/10 = 8/10 = 4/5
19/12 or 1 and 7/12
10/12 + 8/12 = 18/12 or 1 and 6/12 or 3/2 or 1.5
2 3/10
-7/12 + 10/12 = 3/12 = 1/4
3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 17/12
3/8 + 5/12 = 9/24 + 10/24 = 19/24
1/4 + 5/6 = 3/12 + 10/12 = 13/12 = 1 and 1/12
10 + 12/3 + 20 = 34
(5/6) + (3/4) = (10/12) + (9/12) = 19/12 = 1 and 7/12