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In hotel A, what is the difference between the total number of male customers on Monday and Tuesday together and that on Wednesday and Thursday together?

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What is the average number of male customers in hotel B on Monday, Wednesday and Thursday?

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In hotel B, the ratio of female customers on Tuesday and Friday was 2 : 3. If on Friday, female customers constituted 50% of the number of customers (male + female), then what was the number of customers (male + female) in hotel B on Friday?

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The number of customers (male + female) in hotel A and B are increased by 50% and 15% respectively from Thursday to Saturday. If the total number of female customers in hotel A and B together was equal on Thursday and Saturday, what was the total number of male customers in hotel A and B together on Saturday?

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On Wednesday, in hotel A, 30% of male customers and 70% of female customers were from Town X. what was the number of customers in hotel A from town X on Wednesday?

The ratio of present ages of Ratna and Shantanu is 5:4. After 19 years, the ratio of their ages will be 10:9. What is Ratna's present age?

If the length of a rectangle increases by 50% and the breadth decreases by 25%, then what will be the percent increase in its area?

The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?