Varous strength of concrete is specified for a project and are as follows: 15 Mpa for sidewalk 3m by 10m by 200mm thick : 25 Mpa for a floor slab 10mby 15 m by 300m thick: and 35 Mpa for 12No R.C beams20mm wide by 300mm deep. how would place the order for the concrete Question 8 options: 58.2 m3 concrete 45 m3 of 25Mpa concrete 6 m3 of 15Mpa concrete 75 m3 concrete 7.2 m3 of 35Mpa concrete