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Posted on Apr 12, 2012

IQ SOLVED 5*5=2030,3*5=1220,5*3=? - Vivendi Excel@ Mathematics Study Skills (71101) for PC, Mac

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Taavi Kaevats

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  • Posted on Sep 26, 2014
 Taavi Kaevats
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I disagree with pritesh muli on this.. It all comes down to a formula.

Correct formula: a*b = (a*b-a) (a*b+b)
Checkup of examples:
5*5 = 5*5-5 5*5+5 = 25-5 25+5 = 2030 (20 30)
3*5 = 3*5-3 3*5+5 = 15-3 15+5 = 1220 (12 20)
and calculations for the answer:
5*3 = 5*3-5 5*3+3 = 15-5 15+3 = 1018 (10 18)

Correct answer is 1018

problems with previous solution:
1) if it is + - series then first answer should be 3020 not 2030
2) as it appears to be - + series instead the second example would go wrong using this wrong base (squares) instead of multipling (a*b)

according to my knowledge the only correct answer can be 1018

pritesh muli

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  • Posted on Nov 03, 2012
pritesh muli
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2012 is answer
(5) square = 25 , 25-5 = 20 , (5)square = 25 , 25+5 = 30 so == 2030, (3)square = 9 , 9+3 = 12, (5)square = 25 , 25-5 = 20 so == 1220, now
5) square = 25 ., 25-5 = 20, 3)square = 9 , 9+3 = 12


the +,-,+,- series is continued.

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