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Mr. Manmohan calculated the average of 10 'three-digit numbers'. But due to a mistake, he reversed the digits of a number, and thus his average increased by 19.8. Find the difference between the unit digit and hundreds digit of that number.

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Important Questions on Averages

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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 49
Once a peon went to the office of SKYLINE COURIER with 4 different envelopes. The clerk in the office measured the weights in all possible pairs. The weights obtained are 59 gm, 61 gm, 62 gm, 63 gm, 64 gm and 66 gm. Find the weight of the heaviest envelope.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 50
The average expenditure of the hotel, when there are 10 guests is ₹60 per guest, and the average expenditure is ₹40, when there are 20 guests. If it is known that there are some fixed expenses irrespective of the number of guests, then, find the average expenditure per guest when there are 40 guests in the hotel.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 18
Abhay is working in Tele Bharti as a salesperson. His monthly salary is just ₹200. But he gets a bonus as per the following rule. If he sells sim cards of ₹x, then his bonus will be ₹x1002+10. In the first quarter of the year, his average sale was ₹3000 per month. In the next 5 months, his average sale was ₹5000 per month. In the last four months, his average sale was ₹8000 per month. What is the average earning per month for the whole year? 
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 19
The price of shirts at Sahara Ganj is defined as ₹100+10x2, where x is the number of shirts. Mallika purchased five shirts from the shop. Find the average price of a shirt.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 20
The price of shirts at Sahara Ganj is defined as ₹100+10x2, where x is the number of shirts. Mallika purchased shirts from the shop at an average price of ₹70 per shirt. If the sister of Mallika purchased k shirts, but the average price was same as that of Mallika, then the value of k could be _____.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 21
There are 10 compartments in a passenger train which, on an average, carries 20 passengers per compartment. If at least 12 passengers were sitting in each compartment and no compartment has an equal number of passengers, then, maximum how many passengers can be accommodated in any compartment?
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 22
There are twice the number of two-wheelers as there are three-wheelers and the number of four-wheelers is equal to the number of two-wheelers. Find the average number of wheels per vehicle.
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Quantum CAT Also Useful for XAT>Chapter 2 - SNAP>CMAT>Q 28
Asrani is a superintendent jailor in Ramgarh, who is assisted by 6 assistant jailors. Each of the seven jailors supervises a certain but distinct number of jail inmates. He has 30 inmates to look after. Jairaj, another jailor and a close aide of Asrani, supervises an average number of 32 inmates. Each of the seven jailors has to supervise not more than 45 inmates. Once Asrani heard a ruckus within the jail premises, and he instructed his assistants that half of them go to his left and half of them go to his right and the rest shall follow him. But, unfortunately, none was left to follow him. Gabbar Singh, a jail inmate, was curious to know that who went left and who went right. When he asked another inmate, Kalia about the same, he got to know that the ones who supervise more inmates than of Asrani went to the left, and the ones who supervise fewer inmates than Asrani went to the right side. What is the maximum possible difference between the number of inmates supervised by any two sailors?