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- Question
A number consists of two digits whose sum is 11. If 27 is added to the number, then the digits change their places. What is the number?
Options- A. 47
- B. 65
- C. 83
- D. 92
- Correct Answer
- 47
ExplanationLet the ten's digit be x. Then, unit's digit = (11 - x).So, number = 10x + (11 - x) = 9x + 11.
Therefore (9x + 11) + 27 = 10 (11 - x) + x ⟺ 9x + 38 = 110 - 9x ⟺ 18x = 72 ⟺ x = 4.
Thus, ten's digit = 4 and unit's digit = 7.
Hence, required number = 47.
More questions
- 1. NA
Options- A. Raft
- B. Chariot
- C. Sledge
- D. Cart Discuss
Correct Answer: Raft
Explanation:
All Except `Raft' are down by animal.
- 2. NA
Options- A. 729
- B. 123
- C. 423
- D. 621 Discuss
Correct Answer: 729
Explanation:
Only '729' is a perfect cube.
- 3. NA
Options- A. 11
- B. 8
- C. 14
- D. 66 Discuss
Correct Answer: 11
Explanation:
This is the only prime number in the group.
- 4. NA
Options- A. Iron
- B. Mercury
- C. Silver
- D. Gold Discuss
Correct Answer: Mercury
Explanation:
All others are soild metals.
- 5. MO : 13 11 :: HJ :?
Options- A. 19 17
- B. 18 16
- C. 8 10
- D. 16 18 Discuss
Correct Answer: 18 16
- 6. A camera always has
Options- A. Reels
- B. Flash
- C. Stand
- D. Lens Discuss
Correct Answer: Lens
- 7. Root, Stem, Branch
Options- A. Fertilizer
- B. Leaf
- C. Tree
- D. Wood Discuss
Correct Answer: Leaf
Explanation:
All are the parts of tree.- 8. A bulb always has
Options- A. Glass
- B. Current
- C. Filament
- D. Light Discuss
Correct Answer: Filament
- 9. Mash : Horse : : Mast :?
Options- A. Cow
- B. Monkey
- C. Lion
- D. Pig Discuss
Correct Answer: Pig
Explanation:
Former is the food for latter.
- 10. 4 : 9 : : 8 :?
Options- A. 2
- B. 13
- C. 31
- D. 10 Discuss
Correct Answer: 13
Explanation:
As, 4 : 9 similarly 8 : 13
? ? = 13
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