Describe how a 250.0 mL aqueous solution of 1.50 M MgCl2 is prepared from a stock solution of 6.00 M MgCl2.

Question

ANSWER: Measure 62.5 mL of the stock solution into a container and dilute to 250.0 mL

so what i need explained is where did 62.5 mL come from?

Answer 1

M1V1=M2V2
where M1=1.50 M, V1=250.0 mL, and M2=6.00M

Answer 2

just divide the 250mL by 4 to get 62.5, that cuts the molarity by 4 as well