Find the unique four-digit integer n with these properties:

the last digit (the units digit) of n is 9.

the digits of n add up to 27.

two digits of n are the same.

n is a perfect square

How to solve a simultaneous equation involved with fractions?

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?