in a class with a certain number of students , if one student weighing 50kg is added then average weight of class incereases by 1 kg ,if one more student weighin 50kg is added then the average weight of class increasses by 1.5kg over the original average? what isthe original average weight (in kg) of the class?
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( Xi + 50 ) / ( n+1) = Xi / n + 1
how to do
its a long one, there might be a trick
15. Ralph likes 25 but not 24; he likes 400 but not 300; he likes 144 but not 145. Which does he like:
10 50 124 200 1600
well what abt.........
976 : 684
375 : 225
864 : 512
597 : ?
you have 2 equations with 2 variables : the initial average weight (Xi) and the initial number of people (n). The 2 equations are :
(Xi + 50) / (n+1) = Xi + 1
(Xi + 100) / (n+2) = Xi + 1.5
I'd isolate n and solve it from there