http://web2.0calc.com/questions/you-will-need-to-calculate-the-mass-of-food-for-the-animals-on-a-daily-basis-an-elephant-consumes-30-kg-hay-10-kg-carrots-and-5-kg-of-brea
http://web2.0calc.com/questions/how-do-u-solve-3-4-x-2-4x-5-3-2x thanks Chris
http://web2.0calc.com/questions/how-many-grams-are-there-in-3-7-moles-aluminum thanks Alan