1. The price of a mouse pad is $55 less than that of an optical mouse.If the total price of 3 mouse pads and 1 optical mouse is $255.What is the price of an optical mouse?(Show your working)
2. The number of seats in a cinema's Hall A is 5/6 of that of Hall B.Id these two halls have 220 seats altogether,find the number of seats in Hall A and the nuber of seats in Hall B.(Show your working)
3.The price of a model car is $300.John wants to buy the model car and he only has $45 savings.After receiving $x from his mother,John has money more than the price of the model car.Write an inequality to represent this situation.Find the sum of money received from his mother if John just has enough money to buy the model car.(Show your working)
math QUICK!!!! 20點
2013-04-05 1:52 am
回答 (2)
2013-04-05 2:08 am
✔ 最佳答案
1.let the price of an optical mouse is x . SO the price of a mouse pad is (x-55)
3*(x-55) + x =225
3x-165+x =225
4x = 390
x=97.5
so the price of an optical mouse is$97.5
2.
let the number of seats in Hall B is x , and the Hall A is 5/6x.
x+ 5/6x =220
6x+5x=1320
11x+1320
x=120.
so the number of seats in Hall B is 120 ,and Hall A is 5/6(120) =100.
3.
45+ x >= 300
x>= 255
so
John has received $255.
2013-04-04 18:09:01 補充：
第3題,我沒看太明白題目.以我理解應該是這樣
2013-04-09 2:52 am
1. Let the price of an optical mouse be $x
3(x-55)+x=255
3x-165+x=255
4x-165=255
4x=420
x=105
The price of an optical mouse is $105
2.Let the number of seats in Hall A be 5/6x and the number of seats in Hall B be x
5/6x+x=220
11/6(x)=220
x=120
The number of seats in Hall A is 5/6x, x=120, then the number of seats in Hall A is 5/6 times 120=100 , the number of seats in Hall B is 120.
3. The sum of money received from his mother is:
45+x=300
45+x-45=300-45
x=255
The sum of money received from his mother is $255.
Hope I can help you with these questions. >,<
3(x-55)+x=255
3x-165+x=255
4x-165=255
4x=420
x=105
The price of an optical mouse is $105
2.Let the number of seats in Hall A be 5/6x and the number of seats in Hall B be x
5/6x+x=220
11/6(x)=220
x=120
The number of seats in Hall A is 5/6x, x=120, then the number of seats in Hall A is 5/6 times 120=100 , the number of seats in Hall B is 120.
3. The sum of money received from his mother is:
45+x=300
45+x-45=300-45
x=255
The sum of money received from his mother is $255.
Hope I can help you with these questions. >,<
參考: myself
收錄日期: 2021-04-13 19:24:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130404000051KK00285