The recommended calcium intake for teenagers is 1300 mg per day. A glass of milk contains 305 mg of calcium. One glass contains 8 fluid ounces.
One fluid ounce equals 29.6 mL. One Liter contains 1000 mL. How many liters of milk should a teenager drink per day to get the recommended amount
of calcium?
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.
