DATE: …. …….. . . .. .. .W what is the concentration when these 2 solutions listed belowv. are mixed?

DATE: …. …….. . . .. .. .W what is the concentration when these 2 solutions listed belowv. are mixed?

Can someone explain how to find the concentration of 2 solutions when they are mixed? Such as in the question below.
DATE: …. …….. . . .. .. .Wwhat is the concentration when these 2 solutions listedbelowv. are mixed?. . . . . .Solution A250. ml of 1.25 M HCSolution b.. . . . . . . ….150. ml of 2:75 M HCIAnswer=M HCL. . . . . . .