If cement, gravel and sand are to be mixed in 7:10:13 and 9 tons of cement is available how many tons of mixture can be produced assuming that sufficient gravel and sand is readily available.  Choose the correct choice from the following options.
A) 38 7/8
B) 36
C) 38 4/7
D) 34 5/7
E) 34 6/7
Cement:Gravel:Sand = 7:10:13 --&gt; total of   7+10+13= 
<gadget id="calculator">  7+10+13</gadget>
<output>30</output>
30 parts.   If we use 9 tons of cement, then we'll get 9/7*30= 38 4/7 tons of mixture.   Answer: 38 4/7.
<result>C</result>
If cement, gravel and sand are to be mixed in 7:10:13 and 9 tons of cement is available how many tons of mixture can be produced assuming that sufficient gravel and sand is readily available.