1. ## Algebra help

yeah I have a few problems that i can't solve. help..

Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together?

What simple interest rate will Susan need to secure to make $2,500 in interest on a$10,000 principal over 5 years?

Two angles of a triangle measure 15° and 85 °. What is the measure for the third angle?
thanks

2. Originally Posted by angel123
yeah I have a few problems that i can't solve. help..

Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together?

[snip]
Sue fills 2/3 of a pool in 30 minutes and Tony fills 1/3 of a pool in 30 minutes. Therefore Sue + Tony = 1 Jim.

So you effectively have two Jims filling the pool. And if one Jim can fill the pool in 30 minutes, two Jims can fill it in ......

3. Originally Posted by angel123
[snip]Two angles of a triangle measure 15° and 85 °. What is the measure for the third angle?
thanks
Did you know that the sum of the angles in a triangle is 180 degrees ......?

4. Originally Posted by angel123
[snip]
What simple interest rate will Susan need to secure to make $2,500 in interest on a$10,000 principal over 5 years?

[snip]
What formula have you been taught for simple interest ....?

5. ## Word problems

Hello angel123
Originally Posted by angel123
Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together?
In one minute, Jim fills 1/30th of the pool; Sue fills 1/45 and Tony 1/90. So in one minute all three together fill

$\frac{1}{30} +\frac{1}{45} + \frac{1}{90}$ of the pool

$= \frac{3 + 2 + 1}{90} = \frac{6}{90} = \frac{1}{15}$

So it would take 15 minutes to fill.

Originally Posted by angel123
What simple interest rate will Susan need to secure to make $2,500 in interest on a$10,000 principal over 5 years?
The simple interest formula is

$I=\frac{PRT}{100}$

where P is the principal, R is the annual % rate of interest and T is the time in years. You know I, P and T in this question. So plug them into the formula, and solve the equation for R. Can you do that?

Originally Posted by angel123
Two angles of a triangle measure 15° and 85 °. What is the measure for the third angle?
The angles of any triangle add up to 180°.