book Maths Puzzle Numerical Ability

ok find a,b,c,d,e abd f given the following conditions a(b+c+d+e+f)=184 b(a+c+d+e+f)=225 c(a+b+d+e+f)=301 d(a+b+c+e+f)=369 e(a=b=c=d=f)=400 f(a=b=c=d=e)=525 can u find what a,b,c,d

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book Other Question

how can i see how many cases are in solving this rational inequality:(x+1)(x+2)/(x-1)? how will I be able to see the possible cases.What general rule should I actually follow? how do u find the area of a circle with the radius of 5 and 1/3 feet.