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Maths Puzzle
Numerical Ability
Percentage
Instead of multiplying a number by 7, the number is divided by 7. What is the percentage of error
obtained ?
Read Solution (Total 3)
-
- Let the number be 100
then 7*100=700 and 100/7=14.28
error=700-14.28=685.72
error percentage= (685.72/700)*100=97.96 - 14 years agoHelpfull: Yes(26) No(0)
- let no be x
instead of 7*x it's x/7 is done
then % error will be (7x-x/7)/7x
=((49x-x)/7)/7x
=(48x/7)/7x
=48x/49x
=48/49=97.96
so 48/49 or 97.96 is the ans - 14 years agoHelpfull: Yes(11) No(1)
- Let the number be 100. 7*100=700 and 10/7=14.28
Difference is 700-14.28= 685.7[ans] - 14 years agoHelpfull: Yes(1) No(13)
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