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? Choose the correct answer
A) 53 B) 54 C) 55 D) 56 E) 57

Rationale: 70 = red + green - both red = 70 - green + both = 70 - 52 + 38 = 56 answer : d
Answer: D