Every morning halle goes to school with a 1 literwaterbottle she drinks 1/4 of the bottle before school starts and 2/3 of the rest before lunch. How many mililiters are left in the bottle lunch?

To get the amount that remains by lunch time we proceed as follows:

Total amount of water Halle drinks is:

(1/4+2/3)

to add we put the fraction under the same denominator by multiplying the denominators

=4*3=12

thus

1/4+2/3

= (3+2*4) / 12

= (3+8) / 12

=11/12

The fraction water in the bottle when full is 1/1

thus the remaining amount will be:

1/1-11/12

=1/12

Answer is 1/12

given that 1 liter = 1000ml, the remaining amount will be

1/12*1000

=83 1/3 milliters