Algebra

A 1,260-galloon tank is filled by two pipes in as many as the smaller pipe brings in galloons per minute. How long will it take each pipe to fill the tank if the larger pipe brings in one galloon per minute more than the smaller pipe?

A company has a certain number of machines of equal capacity that produced a total of 180 pieces each working day. If two machines breakdown, the workload of the remaining machines is increased by three pices per day to maintain production. Find the number of machines?

A train flies round trip at a distance of X miles each away. The velocity with the head wind is 160mph, while the velocity with tail wind is 240mph, What is the average speed for the round trip?

Hi, can someone help me with my homework in circuits? After getting the KVL and collecting the equations, i got these 3 equations, i can't quite combine them to get a value for IA,IB, and IC.

Eq.1 24I_A-15I_B = 5
Eq.2 12I_B-20I_C+15I_A=5
Eq.3 -27I_C+20I_B=-5

http://imgur.com/j5xTT0v

What is algebra with fractions called ?

1/3, 1, 1/6, 2

is this an arithmetic sequence? i have seen it in a grade 10 book, thanks

A diet must provide exactly 580 mg of protein and 290 mg or iron. These nutrients will be obtained by eating meat and spinach. Each kg of meat contains 900 mg of protein and 200 mg of iron. Each kg of spinach contains 400 mg of protein and 1700 mg of iron. How many kgs of meat and spinach should be eaten in order to provide the proper amounts of nutrients?