Aptitude Quiz 6

Bankers Adda is also known to be called as Aptitude Quiz adda.
Today Bankers Adda came back with a New Quiz on Aptitude
Go through the quiz and if you have any doubts please contact bankers adda in the comment section.

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1.   15      21     33     51    75    (?)
(1) 103
(2) 102
(3) 105
(4) 95
(5) None of these


Explanation:
15      21       33      51       75        (105)
   +6       +12    +18    +24      +30


2.   89.998% of 598.9 + 51.002% of 899.99 – 171.015 = ?
(1) 990
(2) 830
(3) 910
(4) 870
(5) 980


Explanation: 
? = 89.998% of 598.9+51.002% of 899.99 - 171.015
≈90% of 600 + 51% of 900 – 171.05
        ≈540+459 – 171
        ≈830


3.   8999 ÷ 90.005 × 95.998 = ? × 20.999
(1) 420
(2) 320
(3) 540
(4) 525
(5) 457


Explanation:
? = 8999÷90.005×95.998÷20.999
         ≈9000÷90×96÷21
         ≈9600÷21
         ≈457


4.   √(58 × 10 + 120 + 29) = (?)2
(1) 27
(2) √27
(3) 272  
(4) 729
(5) 725


Explanation:
(?)2 = √(58 * 10 + +29)
√729 = 27
? = √27


5.   (39.99)2 – (9.9)2 – (15.1)2 = ?
(1) 1375
(2) 1275
(3) 1100
(4) 1175
(5) 725


Explanation: 
? = 39.992 – 9.92 – 14.92
≈ 402 – 102 – 152
≈ 1275