maths questions problem. Watch

Fahad
Badges: 2
Rep:
?
#1
Report Thread starter 12 years ago
#1
Can someone help me answer these questions i'm having trouble with?

1. A father is 7 times as old as his daughter. In 5 years time he will be 4 times as old as his daughter will be then. How old is each one now?

2. John's mother is 5 times as old as John is. Three years ago, she was 9 times his age. What are their present ages?

3. A straight line ax + by = 12 contains the points (2,2) and (4,5). Form two equations in a and b and solve them.

Thanks.
0
reply
AlphaNumeric
Badges: 10
Rep:
?
#2
Report 12 years ago
#2
1. F = 7D and F+5 = 4(D+5)

Solve for F and D

2. M = 5J and M-3 = 9(J-3)

Solve for M and J

3. ax+by=12 has points (2,2) and (4,5). Put in the values to get

2x+2y = 12 and 4x+5y = 12

Solve for x and y.
0
reply
sul
Badges: 14
Rep:
?
#3
Report 12 years ago
#3
(Original post by AlphaNumeric)
1. F = 7D and F+5 = 4(D+5)

Solve for F and D

2. M = 5J and M-3 = 9(J-3)

Solve for M and J

3. ax+by=12 has points (2,2) and (4,5). Put in the values to get

2x+2y = 12 and 4x+5y = 12

Solve for x and y.
shudnt number 3 be : 2a+2b and not 2x+2y, ?
0
reply
BCHL85
Badges: 12
Rep:
?
#4
Report 12 years ago
#4
(Original post by g_sachs)
shudnt number 3 be : 2a+2b and not 2x+2y, ?
I guess that's his typo :p: ... since they ask for a and b
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 30 Jan '19
  • Solent University
    Careers in maritime Undergraduate
    Sat, 2 Feb '19
  • Sheffield Hallam University
    City and Collegiate Campus Undergraduate
    Sun, 3 Feb '19

The new Gillette ad. Is it:

Man-hating bullsh*t (24)
42.86%
Pro-humanity (32)
57.14%

Watched Threads

View All