one angle of an obtuse triangle is four times the first angle, while the third angle is 30 dgree less than the first[..]

3/a-2a/1-a =2

The same number is added to both the numerator and the denominator of the fraction 7/17 if the fraction becomes 6/11[..]

the length of the basepf a triangle is 1 more than twice it's height. the aera of the triangle is 18 in^2. what is[..]

Angelo and Imee had a total of 480. after angelo spent 20, he had 3 times as much as Imee. how much did angelo have?

Express the fact that x differs from -1 by less than 1 as an inequality involving an absolute value

There are 9 boys in a class of 16 students. What is the ratio of boys to girls? What is the ratio of all students in[..]

Two numbers sum to 44. Twice the first subtracted from the second is 55. Find the numbers.

Mike can run the mile in 6 minutes and Dan can sun the mile in 9 minutes. If Mike gives Dan a head start of 1[..]

A piggy bank contains 7 quarters, 10 half dollars, and 9 dimes. What is the total amount of money in the piggy bank?