Which weighs more 2.5 pounds of rocks or 40 ounces of feathers

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

How do you solve a question like this?

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato