How much was kendra's allowance

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Graph red beads cost $1 an ounce and gold beads cost $3 an ounce. juanita wants to purchase a 12-ounce mixture of red and gold beads that she can sell for $2 an ounce. the solution of the system shows the number of beads needed for juanita to break even. x + y = 12, x + 3y = 24 how many ounces of red beads will juanita buy to break even? how many ounces of gold beads will she buy?

How to solve a simultaneous equation involved with fractions?