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21 Mar 2011, 21:36
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How many times do the keys of a typewriter have to be pressed to write the first 500 positive integers
A. 1391
B. 1392
C. 1393
D. 1394
E. 1395
A. 1391
B. 1392
C. 1393
D. 1394
E. 1395
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21 Mar 2011, 23:07
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1- 10 --> 11 hits
11 - 20 --> 20 hits
similarly 21-30, 31-40.. and so on till 81-90 --> 20 hits each 8 times --> 160
91 - 100 -->21 hits
101 - 110, 111 - 120, and so on to 200 --> 30 hits each ten times--> 300
similarly, 201 to 300, 301 to 400, and 401 to 500 --> 300 hits each --> 900
adding --> 900+300+21+160 +11 = 1392
ans b
11 - 20 --> 20 hits
similarly 21-30, 31-40.. and so on till 81-90 --> 20 hits each 8 times --> 160
91 - 100 -->21 hits
101 - 110, 111 - 120, and so on to 200 --> 30 hits each ten times--> 300
similarly, 201 to 300, 301 to 400, and 401 to 500 --> 300 hits each --> 900
adding --> 900+300+21+160 +11 = 1392
ans b
21 Mar 2011, 23:51
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aiming4mba
We will just use the following concept:
"Numbers between x and y, inclusive=y-x+1"
From 1 to 9:
9-1+1=9
9*1=9 (Multiplied by 1 because all of them have 1 digit)
10 to 99:
99-10+1=90
90*2=180 (Multiplied by 2 because all of them have 2 digits)
100 to 500
500-100+1=401
401*3=1203 (Multiplied by 3 because all of them have 3 digits)
Total=1203+180+9=1392
Ans: "B"
