What number decreased by 5% of itself equals 703?

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4