A certain type of concrete mixture is to be made of cement, sand and graved (gravel?) in a ratio 1:3:5 by weight. What is the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement ?
Options.
A) 13 1/2	B) 15	C) 25	D) 40	E) 45
We're given a ratio of cement, sand and gravel as 1:3:5 by weight. This means that for every 1 kg of cement, we'll mix in 3 kg of sand and 5kg of gravel....   1+3+5= 
<gadget id="calculator">1+3+5</gadget>
<output>9</output>
9 kg of concrete   We're asked for the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement...   From the prior work, we know that 1 kg of cement will get us 9 km of concrete. Since we're dealing with 5kg of cement, we'll end up with (5)(9)= 45 kg of concrete.   Final Answer:45
<result>E</result>
A certain type of concrete mixture is to be made of cement, sand and graved (gravel?) in a ratio 1:3:5 by weight. What is the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement ?