Question
The average weight of a class of 25 student is 60 KG. If
X is student joined the class, than the average weight of whole class increases by (2X – 7)Kg. Find the value of X if the weight of whole class increases by 390 KG.Solution
Sum of weights of 25 student = 25*60 = 1500 kg Sum of the weights of (25+x)(60+2x-7) = {(25+x)(53+2x)} kg As per the question (25+x)(53+2x)-1500 = 390 (25+x)(53+2x) = 1890 2x² + 103x – 565 = 0 X= 5 or (-113/2) Student since the number of student cannot be negative. So our answer will be 5.
Statements: Z = Y ≥ X > W, Q > O = P ≥ I, W ≥ V ≥ U = Q
Conclusions:
I. Z ≥ Q
II. I ≤ W
III. X > P
Statements:
P > Q < R; T ≤ U ≤ Q > S; V ≤ W < T
Conclusions:
I). P > V
II). T = S
III). R > V
...Statement: N < M; G ≤ V = M; J > V; K ≥ M
Conclusion:
I. J > K
II. K ≥ J
In the question, assuming the given statements to be true, find which of the conclusion (s) among given three conclusions is/are definitely true and th...
Statement: T > B = P `>=` C ; B `>=` J > F; O `<=` J `<=` C
Conclusions: I. J < T II. T > F
...Statements: F > G = J ≤ I = L > M ≥ K = N
Conclusion
I: N < I
II: L ≥ G
Statements: W > O > E ≤ N > P; L ≥ U; P > Q = R > U
Conclusions:
I. N > U
II. P > U
III. P < L
IV....
In the question, assuming the given statements to be true, find which of the conclusion (s) among given two conclusions is /are definitely true and the...
Statements: R < S ≤ T = U; V ≤ W = R; P > U ≥ Q
Conclusions:
I. V < T
II. P > W
III. Q < TIn the following questions assuming the given statements to be true, find which of the conclusion among given conclusions is/are definitely true and th...
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