1. The sumof two number is 56 and the difference is 22. Find large number.
2. In a certain class, threre are 8 moreboys than girls. If there are altogether 44 students in the class, find the number of girls.
3. When a number is increasedby32% and thenmultiplied by 80%, the result is 1.9008. Find the number.
4. Adding 28 to 3 times of a number is equal to 12 added to 5 times the number. Find the number.
5. Mr Chan had a sum of money. He first used 40% of it and then used 30% of the rest. He then had $210 left. How much did he have originally?
6. If Mr Chan sells a chair at $250, then he gains 25%. What will be the loss percentage if he sells the chair at $180?
7. A rectangular vessel of height 1.5m, length 0.8m and width 0.6 is filled up with oil. If the priceof oil in the veesel.
數學唔識做
2008-08-07 11:36 pm
回答 (2)
2008-08-08 12:18 am
✔ 最佳答案
Let n be the smaller number .n 22 n=56
2n 22=56
2n=34
n=17
The smaller number is 17, and the larger number is 17 22=39.
2008-08-07 16:19:48 補充：
Let n be the smaller number .
n加 22 加n=56
2n 加22=56
2n=34
n=17
The smaller number is 17, and the larger number is 17加 22=39.
參考: 自己計
2008-08-17 12:29 am
1. Let a and b be the two numbers, then a+b=56, a-b=22, imply that 2a=78, so a=39 and 2b=34, so b=17; That is the large number is a=39.
2. Let the number of girls be y, then (8+y)+y=44; That is y=18 girls.
3. Let the number be y, then 1.32y*0.8=1.9008.
4. Let the number be y, then (28+3y)=(12+5y).
5. Let sum of money be y originally, then (y-0.4y)*0.3=210.
6. Let the cost of a chair be y, then 250-y=0.25y and ((y-180)/y)*100%=answer.
7. The question is not expressed completely!!! Please state again!
2. Let the number of girls be y, then (8+y)+y=44; That is y=18 girls.
3. Let the number be y, then 1.32y*0.8=1.9008.
4. Let the number be y, then (28+3y)=(12+5y).
5. Let sum of money be y originally, then (y-0.4y)*0.3=210.
6. Let the cost of a chair be y, then 250-y=0.25y and ((y-180)/y)*100%=answer.
7. The question is not expressed completely!!! Please state again!
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