問題：
1.The number of ordinary rooms and that of de luxe rooms in Brightness Hotel are the same. An ordinary room is $300 per night while a de luxe room is $450 per night?
(a). If ten ordinary rooms are upgreded to de luxe rooms, the total amount received per night is $39000 when the hotel is full. What is the original number of ordinary rooms?
(b). Two groups of tourists A and B stay one night in the hotel. Group A stays in the ordinary rooms while Group B stays in de luxe rooms. The number of rooms occupied by Group B is 10 less than that occupied by Group A. The rents paid by
these two groups are the same. How much rent does each group pay?
2.(a). Try to use the following methods of estimation to round the numbers in the expression 235 x 52 correct to the nearest ten. Then find the estimated value of the expression.
(i) Round off
(ii) Round up
(iii) Round down
(b). David wants to fill 52 cups with soft drink and each cup holds 235 ml of liquid. Pick one of the methods of eatimation mentioned in (a) above to find out how many 1L bottled soft drink should be bought to fill all the cups.
更新1:
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