Talil is going to make some concrete mix. He needs to mix …
In order to answer this question you need to find out how much cement, sand and gravel is needed to make 180kg of concrete mix. To do this you must find out how many parts the concrete mix ratio is made up (1+3+5=9). Then divide the total concrete mix (180kg) by the number of parts; 180/9 = 20. This tells you that each of the 9 parts of the ...