Peter R. answered 02/01/23
Experienced Instructor in Prealgebra, Algebra I and II, SAT/ACT Math.
Could also use substitution method since A = 55 - S
30A + 25S = 1525
30(55 - S) + 25S = 1525
Use distributive rule to eliminate the parentheses, combine like terms, solve for S and then for A and check your results.