Mark M. answered • 07/19/16

Tutor

5.0
(243)
Mathematics Teacher - NCLB Highly Qualified

x represents the amount removed/replaced

0.3(11 - x) + x = 0.5(11)

3.3 - 0.3x + x = 5.5

3.3 + 0.7x = 5.5

0.7x = 2.2

x ≈ 3.14