help to 計
1)Joseph has k stamps.David has 4 stamps mpre than 3 times the syamps Joseph has.
1A) Express the number of stamps David has in terms of k
1B) If they have a total of 60 stamps,how many stamps does joseph have?
2) Johnny pays $105 for 3 books and 6 packs of tissue paper.If the price of each
book is 12 times that of a pack of tissue paper,find the price of
2A) a pack of tissue paper
2B) 4 books and 2 packs of tissue paper
3) Victor's running speed is twice his walkingspeed.After running for 2 hours and
then walking for 3 hours,he has travelled 21 km.What is his walking speed?
4) Two cars A and B 250 km apart are travelling towards each other on the same road.The travelling speed of car B is 5 km/h more than 5/7 of the speed of car A
They will meet after 2 hours.Find the travelling speed of each car.
s1 English Maths Algebraic
2013-11-03 6:33 am
回答 (2)
2013-11-03 7:21 am
✔ 最佳答案
I am Form 2 now so trust me,I am good at algebraBut hope I am right in question 3-4,coz I am not very good at speed.
This is all I can help,hope it will help you.
1a)3k+4
1b)k+3k+4=60
4k+4=60
4k=56
K=14
2a)let a pack of tissue be $x, a book be $12x
6x+3(12x)=105
42x=105
X=2.5
2b)2x+4(12x)
=50x
=50(2.5)
=125
3)let his walking speed be x km/h
2(2x)+3x=21
7x=21
X=3
4)let the speed of car A be x km/h, car B be 5+ 5/7 x (5 over 7,x)
2(x+5+5/7 x)=250
2x+10+10/7 x=250
2x+10/7 x=240
7(2x)+7(10/7 x)=7(240)
14x+10x=1680
X=1680/24
X=7
Car A=7 km/h
Car B=5+5/7 x
=5+5/7(7)
=5+5
10 km/h
參考: Me
2013-11-03 7:27 am
1a. 3k+4
1b. 3k+4+k=60
4k+4=60
4k=56
k=14
2a. 3b+6t=105
b=12t
So, 36t+6t=105
42t=105
t=2.5
2b. From 2a. t=2.5 , b=30
4b+2t
=120+5
=125
3a. r=2w
2r+3w=21
So, 4w+3w=21
7w=21
w=3
Walking speed = 3km per hour
1b. 3k+4+k=60
4k+4=60
4k=56
k=14
2a. 3b+6t=105
b=12t
So, 36t+6t=105
42t=105
t=2.5
2b. From 2a. t=2.5 , b=30
4b+2t
=120+5
=125
3a. r=2w
2r+3w=21
So, 4w+3w=21
7w=21
w=3
Walking speed = 3km per hour
收錄日期: 2021-04-13 19:47:00
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