Question : The average daily expenditure of Mohan over 4 days is INR 120. If his expenditure on the first 3 days are INR 60, INR 150 and INR 140, respectively, then what is his expenditure on the $4^{\text {th }}$ day?
Option 1: INR 145
Option 2: INR 110
Option 3: INR 130
Option 4: INR 120
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Correct Answer: INR 130
Solution : Average daily expenditure of Mohan over 4 days = INR 120 Sum of expenditure over 4 days = 120 × 4 = 480 Expenditure on the first 3 days = INR 60, INR 150 and INR 140 Let $x$ be the expenditure on the $4^{\text {th }}$ day. So, $x$ + 60 + 150 + 140 = 480 ⇒ $x$ = 480 – 350 = 130 Hence, the correct answer is INR 130.
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Question : The average expenditure of Raman for 5 days is Rs. 160. If his expenditure for the first 4 days is Rs. 90, Rs. 135, Rs. 75, and Rs. 180 respectively, then what is his expenditure on the 5th day?
Option 1: Rs. 360
Option 2: Rs. 320
Option 3: Rs. 280
Option 4: Rs. 250
Question : There are 45 students in a hostel. If the number of students increases by 5, the total expenses of the mess increase by INR 30 per day while the average daily expenditure per head diminishes by INR 2. Find the original total daily expenditure of the mess.
Option 1: INR 1,170
Option 2: INR 1,710
Option 3: INR 1,200
Option 4: INR 1,250
Question : The average life span of red blood corpuscles is about:
Option 1: 100 - 200 days
Option 2: 100 - 120 days
Option 3: 160 - 180 days
Option 4: 150 - 200 days
Question : The monthly income of a person is INR 15,000. He saves 20% of his income. If his income increases by 10% and his nominal savings remain the same, then what will be his new expenditure?
Option 1: INR 13,000
Option 2: INR 14,500
Option 3: INR 13,500
Option 4: INR 14,000
Question : Mahesh and Suresh can complete work alone in 20 days and 30 days, respectively. They received INR 3300 for completing the work together. What is the share of Mahesh?
Option 1: INR 1720
Option 2: INR 2080
Option 3: INR 1800
Option 4: INR 1980
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