Question 85597
S=200 + 20R - 5W

Substituting S = 525 and R = 19,

525 = 200 + 20(19) - 5w

==> 525 - 200 = 380 - 5w

==> 325 = 380 - 5w

==> 5w + 325 = 380

==> 5w = 380 - 325

==> 5w = 55

==> w = 55/5

==> w = 11

No: of wrong answers = 11