Question 19

The average spending of Lata Mangeshkar for the part of week from Monday to Saturday is Rs. 4200. She spent Rs. 1200 on Monday and Rs. 1500 on Sunday that week. The average spending for the part of week from Tuesday to Sunday that week is?

Solution
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Let the spending for Monday, Tuesday, Wednesday, Thursday, Friday, Saturday , Sunday be {M, T, W, Th, F, Sat, Sun} , Now, given are :

M+T+W+Th+F+Sat = 6(4200) = 25,200
M = 1200
Sun = 1500

Now, by substituting Mon = 1200 in first equation, we get T+W+Th+Fr+Sat = 25,200-1200 = 24,000

Hence, average for Tuesday to Sunday is $$\dfrac{\ 24000+1500}{6}\ =\ 4250$$

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