Discussion :: Average
- The average weight of P, Q and R is 45 kg. If the average weight of P and Q is 40 kg and that of Q and R is 43 kg, what is the weight of Q?
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Answer : Option D
Explanation :
Let P, Q, R represent their respective weights. Then, we have:
P + Q + R = (45 x 3) = 135.... (i)
P + Q = (40 x 2) = 80.... (ii)
Q + R = (43 x 2) = 86.... (iii)
Adding (ii) and (iii), we get: P + 2Q + R = 166.... (iv)
Subtracting (i) from (iv), we get: Q = 31.
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