7   21   3
d   7   33
If 'd' is the resultant of the first row, what will be the resultant of the second row?

Rules
(i) (Odd number) x (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) ? (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 24   64   15 ? 64 - 24 = 40       [rule (iii)]
?     40 + 15 = 55     [rule (ii)]
          = m
2nd Row m   11   15 ? 55   11   15
?         55 ÷ 11 = 5   [rule (iv)]
?       5 x 15 = 75     [rule (i)]
? Resultant of second row = 75

Rules
(i) (Odd number) x (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) ? (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 58   17   5 ? 58 + 17 = 75       [rule (ii)]
?     75 ÷ 5 = 15     [rule (iv)]
          = n
2nd Row 85   5   n ? 85   5   15
?         85 ÷ 5 = 17   [rule (iv)]
?       17 x 15 = 255     [rule (i)]
? Resultant of second row = 255

Rules
(i) (odd number) + (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) ? (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 36   15   3 ? 36 + 15 = 51       [rule (ii)]
?     51 ÷ 3 = 17     [rule (iv)]
          = n
2nd Row 12   3   n ? 12   3   17
?         12 + 3 = 15   [rule (ii)]
?       15 ÷ 17 = 15/17     [rule (iv)]
? Resultant of second row = 15/17

Rules
(i) (odd number) + (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) ? (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 28   49   15 ? 49 - 28 = 21       [rule (iii)]
? 21 + 15 = 36     [rule (i)]
          = h
2nd Row h   3   12 ? 36   6   12
?         36 + 3 = 39   [rule (ii)]
?       39 - 12 = 27     [rule (v)]
? Resultant of second row = 27

Rules
(i) (odd number) + (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) ? (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 24   15   3 ? 24 + 15 = 39       [rule (ii)]
?     39 ÷ 3 = 13     [rule (iv)]
          = d
2nd Row d   6   15 ? 13   6   15
?         13 - 6 = 7   [rule (v)]
?       7 + 15 = 22     [rule (i)]
? Resultant of second row = 22

Rules
(i) (Odd number) x (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) ? (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 73   34   13 ? 73 - 34 = 39       [rule (v)]
?     39 ÷ 13 = 3 = p     [rule (iv)]
2nd Row 32   p   15 ? 32   3   15
?         32 + 3 = 35   [rule (ii)]
?       35 x 15 = 255     [rule (i)]
? Resultant of second row = 525

Rules
(i) (Odd number) x (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) ? (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 14   5   9 ? 14 + 5 = 19       [rule (ii)]
?     19 x 9 = 171     [rule (i)]
        = w
2nd Row 24   w   88 ? 24   171   88
?         24 + 171 = 195   [rule (ii)]
?       195 - 88 = 107     [rule (v)]
? Resultant of second row = 107

Rules
(i) (2-digit even number) ÷ ( Even number)
(ii) (Even number) x (Prime number)
(iii) (Odd number) + (Odd number)
(iv) (3-digit number) - (2-digit perfect square number)
(v) (3-digit number) ÷ (2-digit non-perfect square number)
Solution
1st Row 84   14   13 ? 84 ÷ 14 = 6       [rule (i)]
?     6 x 13 = 78     [rule (ii)]
2nd Row 360   24   17 ? 360 ÷ 24 = 15     [rule (v)]
?         15 + 17 = 32     [rule (iii)]
? Resultant difference = 78 - 32 = 46

16 x 2 ÷ 25 + 7 - 4
= 16 ÷ 2 + 25 - 7 x 4
= 8 + 25 - 28
= 25 - 20 = 5

From option (b),
49 - 7 + 3 ÷ 5 x 8 = 24
Change the sign, as per the question,
49 ÷ 7 x 3 - 5 + 8 = 24
? 7 x 3 - 5 + 8 = 24
? 21 - 5 + 8 = 24
? 24 = 24