To add mixed numbers, the first step is to convert them into improper fractions.
20 4/7 = (720 + 4)/7 = 144/719 3/4 = (419 + 3)/4 = 79/416 4/7 = (7*16 + 4)/7 = 116/7
Now we can add these fractions:
(144/7) - (79/4) + (17) - (116/7)
L.C.M = 7*4 = 28
(4144 - 779 + 417 - 4116)/28
(576 - 553 + 68 - 464)/28
(23 + 68 - 464)/28
(91 - 464)/28
-373/28
Therefore, the answer is -373/28.
To add mixed numbers, the first step is to convert them into improper fractions.
20 4/7 = (720 + 4)/7 = 144/7
19 3/4 = (419 + 3)/4 = 79/4
16 4/7 = (7*16 + 4)/7 = 116/7
Now we can add these fractions:
(144/7) - (79/4) + (17) - (116/7)
L.C.M = 7*4 = 28
(4144 - 779 + 417 - 4116)/28
(576 - 553 + 68 - 464)/28
(23 + 68 - 464)/28
(91 - 464)/28
-373/28
Therefore, the answer is -373/28.