a) Rs. 400
b) Rs. 420
c) Rs. 432
d) Rs. 442
Answer: b
Explanation: Let the original expenditure of the mess per day be Rs. x
Then, new expenditure
= Rs. (x + 42)
$$\eqalign{
& \therefore \frac{x}{{35}} – \frac{{\left( {x + 42} \right)}}{{42}} = 1 \cr
& 6x – 5\left( {x + 42} \right) = 210 \cr
& x – 210 = 210 \cr
& x = 420 \cr} $$
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