At a school, fourth, fifth and sixth graders sold flowers as a fundraiser. The adjoining graph shows how many flowers were sold by each grade. How many flowers did the students sell in all? 
A20
B35
C40
D70
Ans 1: (Master Answer)
Class : Class 1
(D)
Number of flowers sold by students of grade 4 = 20
Number of flowers sold by students of grade 5 = 35
Number of flowers sold by students of grade 6 = 15
Total number of flowers sold by all students = 20+35+15 =70