Answer :
175 - 75 = 400 ÷ z
170 = 400 ÷ z
170 = 400
1 z
170 × z = 400 × 1
170z = 400
170z = 400
170 170
z = 2.352941176
170 = 400 ÷ z
170 = 400
1 z
170 × z = 400 × 1
170z = 400
170z = 400
170 170
z = 2.352941176