Mathmetics

ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

Q31.
35% of a number is 175. What % of 175 is the number ?
1) 285.71% 2) 283.71%
3) 289.91% 4) 285.71%
5)None of these
Answer : 285.71%
Explanation : Let ‘x’ be the number 
(35/100)x = 175
or  x= (175 x 100)/35
So,required percentage = (500/75)/100 =  285.71%


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Q32.
A candidate scoring 25% in an examination fails by 30 marks while another candidate who scores 50% marks gets 20 marks more than the minimum required for a pass. Find the full mark in the examination ?
1) 200 2) 240
3) 240 4) 500
5)None of these
Answer : 200
Explanation :
Let, the full mark be x.
The first candidate's pass mark = (25/100)x +30
The second candidate's pass mark = ( 50/100 )x-20
So,  (25/100)x +30 = ( 50/100 )x-20
       Or x= 200
Shortcut  Method :
             Full-Mark = (Diff. in marks / diff.in %) x 100
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Q33.
In an election between two candidates, one got 55% of the total valid votes, 20% of the votes were invalid. If the total number of votes was 7500, the number of valid votes that the other candidate got, was:
1) 2500 2) 2600
3) 2700 4) 3000
5)None of these
Answer : 2700
Explanation :

Number of valid votes = 80% of 7500 = 6000.

So, Valid votes polled by other candidate = 45% of 6000

= (45/100 x 6000 = 2700.

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