Mark is making concrete. Concrete is made by mixing cement, sand and gravel in the ratio 1:2:3. Mark wants to make 600kg of concrete. How much sand does Mark need

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

The box plots show the average speeds, in miles per hour, for the race cars in two different races. which correctly describes the consistency of the speeds of the cars in the two races?