Question : Directions: Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
4 × 5 = 42
5 × 6 = 56
6 × 7 = 72
7 × 8 = ?

Option 1: 84

Option 2: 90

Option 3: 92

Option 4: 102

Question : Directions: Some equations are solved based on a certain system. Find the correct answer for the unsolved equation on that basis.
5 * 6 = 35; 8 * 4 = 28; 6 * 8 = ?

Option 1: 46

Option 2: 34

Option 3: 23

Option 4: 38

Question : Directions: Some equations are solved based on a certain system. Find out the correct answer for the unsolved equation on that basis.
7 @ 6 @ 4 = 674, 8 @ 5 @ 3 = 583, 9 @ 1 @ 2 = ?

Option 1: 292

Option 2: 727

Option 3: 192

Option 4: 462

Question : Directions: Some equations are solved based on certain systems. On the same basis, find the correct answer from amongst the four alternatives for the unsolved equation in the question.
a = 12(390)8; b = 7(134)5; c = 5(?)12

Option 1: 299

Option 2: 289

Option 3: 279

Option 4: 280

Question : Directions: If + means –, – means ×, × means ÷, ÷ means +, then what will come in place of the question mark (?) in the following equation?
14 – 7 ÷ 42 × 6 + 33 = ?

Option 1: 72

Option 2: 84

Option 3: 68

Option 4: 56

Question : Directions: Which two digits and signs can be interchanged to balance the given equation?
25 – 9 + 42 ÷ 6 × 7 = 17

Option 1: 9 and 6; + and ×

Option 2: 2 and 5; ÷ and ×

Option 3: 5 and 7; – and ÷

Option 4: 4 and 6; + and ÷