Question

how many times can 250ml be taken from 2.5l

Answer 1

1 liter = 1,000 milliliters

$2.5*1000=\\2500\\\frac{2500}{250}=\\10$

10 times.

Answer 2

$1l=1,000ml\\\\therefore\ 2.5l=2.5\times1,000ml=2,500ml\\\\\frac{2,500ml}{250ml}=\boxed{10\ (times)}$