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12 May 2016, 01:50
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (00:41) correct
12%
(00:39)
wrong
based on 434
sessions
History
Date
Time
Result
Not Attempted Yet
(3 x 10^4) + (2 x 10^2) + (4 x 10) =
A. 302400
B. 32400
C. 30240
D. 3240
E. 324
A. 302400
B. 32400
C. 30240
D. 3240
E. 324
12 May 2016, 07:23
Kudos
Bookmarks
Bunuel
Hi
When you multiply a number by 10 you just add a zero
=> 3 x 10^4 => add 4 zeros => 3 x 10^4 = 30000
=>2 x 10^2 = 200
=> 4 x 10 = 40
=>3 x 10^4 + 2 x 10^2 + 4 x 10 = 30000 + 200 + 40 = 30240
=> answer is C ( 30240)
12 May 2016, 07:46
Kudos
Bookmarks
Bunuel
\((3 * 10^4)\) + \((2 * 10^2)\) + \((4 * 10)\)
\((3 * 10^4)\) will have 4 zeros after 3; Total No of digits will be 5
\((2 * 10^2)\) will have 2 zeros after 2 ; Total No of digits will be 3
\((4 * 10)\) will have 1 zeros after 4; Total No of digits will be 2
SO WE WILL HAVE A 5 DIGIT NUMBER ( ONLY OPTIONS B & C SATISFIES )
THe last 2 digits will be 40 ( Since last 2 digits \((4 * 10)\) = 40 )
Hence answer will be (C)
