The recommended calcium intake for teenagers is 1,300 mg per day. A glass of milk

Therefore a teenager should drink 1.0093 L per day.

Explanation:

Given that,

The recommended calcium intake for teenagers is 1,300 mg per day.

A glass of milk contains 305 mg Ca.

So, 305 mg Ca is contained by 1 glass of milk.

        1   mg Ca is contained by  1/305 glass of milk.

    1300 mg Ca is contained by 1300/305 glass of milk.

                                                   =260/61 glass of milk.

One glass milk contains a volume of eight fluid ounce = (8×29.6) mL =236.8 mL.[∵1 fluid ounce = 29.6 m L]

∴260/61 glass of milk = (260/61)×236.8 mL.

                               ≈1009.3 mL

                               =(1009.3÷1000) L   [∵ 1000 mL= 1L]

                               =1.0093 L

Therefore a teenager should drink 1.0093 L per day.