How many times can 21 go into 12?

Why is there no 'zero' in the 'loop the loop' puzzle in Delhi Times for the past month or so? How much pressure is 7 inches of water column? The diagram below de and ef are tangent to o what is the measure of e? Where would you see an octagon? What is 5 and 4 fifths plus negative 3 and 2 sevenths? What is the difference between vertices and corners? What is 9.7 as a mixed number in the simplest form? 5'10 into cm? Is 0.310 less than 0.275? What is 0.2 as decimal? Find the series 11 28 327 464? How do you describe a angle? What is 10 percent of 4.39 kilograms? What is 9602 in expanded form? What is yield equivalent value of different crops? How many cents in9.61? How many times is 'wise' used in the Bible? What does column mean in math terms? How many different outfits can you make from five hats eight dresses and three pair of shoes? What is different between a parallelogram and a rhombus?