Test of Reasoning - Hidden Equations

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1. If 12 x 7 = 408 and 9 x 8 = 207 then 13 x 7 = ?  

  1. 190
  2. 91
  3. 901
  4. 109

2. a = 11 (242) 121 ; b = 14 (392) 196 ; c = 13 (?) 169  

  1. 182
  2. 338
  3. 2197
  4. 28224

3. 323 x 41 = 14323, 137 x 72 = 27731, 48 x 87 = 7884, 34 x 75 = ?  

  1. 2550
  2. 5743
  3. 7534
  4. 4357

4. 11 x 12 x 13 = 234, 24 x 23 x 35 = 658, 31 x 43 x 54 = ?  

  1. 497
  2. 974
  3. 749
  4. 479

5. 16 (210) 14, 14 (156) 12, 12 (?) 10  

  1. 110
  2. 100
  3. 120
  4. 90

6. A = 3(21)247, B = 5(-)407, C = 7(49)567  

  1. 28
  2. 25
  3. 35
  4. 38

7. 7 x 5 x 4 = 57354, 8 x 7 x 3 = 78563, then 6 x 8 x 5 = ?  

  1. 86585
  2. 86855
  3. 68485
  4. 86485

8. If 14 x 13 = 128 and 16 x 13 = 280 then 15 x 11 = ?  

  1. 516
  2. 156
  3. 165
  4. 615

9. If 264 * 2 = 6, 870 * 3 = 5, then what should be 735 * 5 be equal to  

  1. 3
  2. 5
  3. 12
  4. 16

10. A = 51 (714) 14; B = 61 (915) 15; C = 71 (1136) 16; D = 81 (?) 17  

  1. 1377
  2. 1378
  3. 1356
  4. 1346

11. If 10 – 3 = 12, 12 – 4 = 13, 14 – 5 = 14, what is 16 – 6 ?  

  1. 10
  2. 15
  3. 16
  4. 18

12. If 1 + 4 = 9, 2 + 8 = 18, 3 + 6 = 15, then 7 + 8 = ?  

  1. 23
  2. 30
  3. 32
  4. 41

13. If 123 = 14 and 323 = 22, then 624 = ?  

  1. 60
  2. 72
  3. 56
  4. 55


14. If 324 x 289 = 35, 441 x 484 = 43, 625 x 400 = 45, find the value of 256 x 729.  

  1. 33
  2. 35
  3. 43
  4. 34

15. If 94 + 16 = 42, 89 + 23 = 78, then 63 + 45 = ?  

  1. 18
  2. 28
  3. 38
  4. 48

16. If 9 * 7 = 32, 13 * 7 = 120, 17 * 9 = 208, then 19 * 11 = ?  

  1. 150
  2. 180
  3. 210
  4. 240

17. If 8 + 8 = 72, 5 + 5 = 30 and 7 + 7 = 56, what is 6 + 6 = ?  

  1. 40
  2. 42
  3. 30
  4. 36

18. 7, 2 = 59; 5, 3 = 28; 9, 1 = 810; 2, 1 = 13; 5, 4 = ?  

  1. 19
  2. 9
  3. 20
  4. 239

19. If 8 x 2 = 61 : 8 x 5 = 04, what is 8 x 10 = ?  

  1. 80
  2. 08
  3. 81
  4. 18

20. 27(18)3; 216(180)6; 729(?)9  

  1. 810
  2. 700
  3. 81
  4. 648