Simple formulas for Math needed....

I need help with some formulas I always seem to forget. If anyone has any ideas on how to remember them better please also let me know that. I know the answers from my head, but the formulas get me on these.


A perimeter of a rectangle is 38 cm. The length is 3 cm more than the width. What are the dimensions?


The sum of 2 consecutive integers is 493. Find the integers.

A hotel managers salary is 61,000.00 which is a 12% increase over last years salary. What was the previous years salary?

A 20 foot board is cut into 2 pieces. The length of one piece is 2 more than twice the other piece. Find the length of the two pieces.




I simply need the formulas because I left my book at school. Any help would be appreciated.

The first one is 8 and 11.

Second one is 246 and 256.

Last one is 9 and 11.




[Edited on 2/10/2004 by surfup]

Not sure how to write general formulas for them, but I'll try to help.

A perimeter of a rectangle is 38 cm. The length is 3 cm more than the width. What are the dimensions?

Let x= the width
Let x+3 =the length

2x+2(x+3)=38

The sum of 2 consecutive integers is 493. Find the integers.

Let x= 1st integer
Let x+1=Consecutive integer

x+(x+1)=493

A hotel managers salary is 61,000.00 which is a 12% increase over last years salary. What was the previous years salary?

Let x= Last yrs salary

x+0.12x=61000

A 20 foot board is cut into 2 pieces. The length of one piece is 2 more than twice the other piece. Find the length of the two pieces.

Let x=Length of one piece
Let 2x+2=length of other piece

x+2x+2=20

[Edited on 2-10-04 by Saucerat]

I understand what the answers are. What I need is the formula's that can get you to the answers.

Saucer THANK you ....Those are exactly what I was looking for.

[Edited on 10-2-2004 by Dreamz]

No problem.

If you need any other math help, just send me a U2U and I'll see what I can do.

Originally posted by Dreamz
I understand what the answers are. What I need is the formula's that can get you to the answers.

Sorry.

First one = x*2 + (x+3)*2 = 38 and then you solve for x.

Second one = X + X + 1 = 493

I don't remember the formula for the third one.

Last one = X + X + 1 = 246.

Damit, someone beat me to it.

[Edited on 2/10/2004 by surfup]

Word problems are some of the most misunderstood ideas in math although they are normally easier than they seem.

If anyone needs help including Thermodynamics and Calc 4 I can help.

note to self: have ATS people do my homework