Thread: Tricky question

Set 1

9 X 5
200 / 10
50 + 6
5 % of 400

Set 2

50 - 2
4 X 5
25 + 28
100 / 5
(-7a) - (-12a)
674 - 654
3 X 18

Set 3

23 + 22
67 + (-47)
44 932 / 956
21 - 1
8.6 X 5
9 + 11

Set 4

62 - 3
20 X 1
2a + 7a - 3b - 9a +7b
40 / 2
29 + 14
10 + 10
4c - a + 2a + 4b - 3b -a -b
59 - 39
15 X 3
19 + 1
100 - 47
300 / 15
60 - 4
4 X 5
0 + 5a

Set 5

24 X 2
16 + 4
62 - 6
40% of 50
11 X 5
20 - 0
75- 20
2 X 10
50 + 6
20 / 1
3 X 14

Set 6

135 / 3
3 + 17
56 - 9
100 / 5
11 + 32
2 X 10

Set 7

3a + 2a
19 + 3 - 2
43 - 2 + 2
10 X 2
3f + f
4 X 5
180 / 4

Set 8

2e + 2e
2 X 10
110 / 2
200/10
50b / 12.5b
4 X 5
50 - 7

Set 9

47 + 6
40 / 2
3a + 2a

Set 10

23 + 22
67 + (-47)
44 932 / 956
21 - 1
8.6 X 5
9 + 11

Set 11

11 X 5
20 - 0
26 + 26
12 + 8
(-4c) - (-8c)
45 - 25
9 X 5

Set 12

43 - 2
4 X 5
224 / 4
2 + 18
(-2a ) + 4c + 3a - a
11 + 9
5 X 9

Set 13

28 X 2
46 - 26
250 / 5

Set 14

135 / 3
3 + 17
56 - 9
100 / 5
11 + 32

Set 15

60 - 3
10 X 2
25 + 27
100 / 5
25 x 2
21 - 1
90 - 37
20 X 1
7e - 3e


Set 16

35 + 11
4 X 5
75 - 19
40 / 2
3f + f

Where is the question? I don't know ^^
Good Luck!

Explain your answer! ^^

The question is : How many sets are there? ^^