Double a certain number and subtract 4 the result is 6 and what is the number

What is the best estimate of the length of a football

How do i take any fraction and make it into a decimal or percentage?

Several paint mixtures are made by mixing blue paint and white paint. paint colors blue paint white paint mixture a 5 cups 12 cups mixture b 6 cups 6 cups mixture c 4 cups 12 cups mixture d 5 cups 6 cups which mixture has the highest ratio of blue paint to white paint