70 students are required to paint a picture. 52 use green color and some children use red, 38 students use both the colors. How many students use red color?  Pick:
A) 53
B) 54
C) 55
D) 56
E) 57
70 = red +green -both   Red = 70-green+both = 70-52+38= 
<gadget id="calculator">70-52+38</gadget>
<output>56</output>
56   ANSWER:56
<result>D</result>
70 students are required to paint a picture. 52 use green color and some children use red, 38 students use both the colors. How many students use red color?