A group of students were asked to choose between blue and red, the colour they like 70% chose blue and 50% chose red. Each student in the group chose at least one of the two colours.

i. Represent the information on a Venn diagram.

ii .If 10 students chose both colours, find the number of students who chose:
a. only red
b only blue

iii. How many students were in the group?​