暑期hw黎:-)
1) a store bought 250eggs for $200 and foung that 25 of them were cracked.The rest of the eggs will be sold at a percentage profit of not greater than 35%, Find the maximum selling price of each egg
2)Is there any regular polygon with exterior angles of 27° each?Explain briefly.
3)It is known that the mean of the number of push-ups done by S2A boys in a minute is21;that done by the S2A girls is 9;and that done by the whole class is13.4. If there are 30 students is S2A, find the number of boys and the number of girls in the class. 作者: iamsiuyanyan 時間: 2012-8-20 09:15 PM
1) let $x be the maximum selling price of each egg
(225x-200)/200 <= 35%
x<=1.2
the maximum selling price of each egg is $1.2
3)let x be the number of boys and y be the number of girls
(21x+9y)/30=13.4...................(1)
x+y=30......................................(2)
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x=11
y=19 作者: MrBenwong 時間: 2012-8-20 11:18 PM
2. Let a polygon with n sides.
27n = 360
n = 13.3333333333
Since n must be a positive integer, therefore the polygon required does not exist. 作者: 小華囝;-D 時間: 2012-8-21 04:39 PM
thanks