The answer is 76. Simply add up all of the numbers arithmetically like you would for two plus two. To make sure the answer is correct, check your work using a calculator.
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
12 - 3 + (4 x 2) = 17
24 + 23 + 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 300
3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 17/12
1+16=17 --------------------------------------- 2+15=173+ 14=17 --------------------------------------- 4+13=175+12=17 --------------------------------------- 6+11=177+10=17 --------------------------------------- 8+9=17
14 ! If n=12, then 12-4 is 8, plus 6 is 14
4 + 8 + 12 + 16 + 14 + 28 + 37 = 119
37
17
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
if you mean [ 2/3 ] + 4 then it 14/3. 3*4 = 12 12 + 2 = 14 14/3
1 + 2 + 3 + 4 + 6 + 7 + 12 + 14 + 21 + 28 + 42 = 140
24 + 17 = 41 2/4 + 1/7 = 14/28 + 4/28 = 18/28 = 9/14
2+12-7*4/2 = 2+12-28/2 = 2+12-14 = 14-14 = 0
12 - 3 + (4 x 2) = 17
153
24 + 23 + 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 300