WAEC - Mathematics (2007 - No. 61)
The venn diagram shows the choice of food of a number of visitors to a canteen. How many people took at least two kinds of food? If there were 35 visitors in all
10
12
15
17
解释
at least 2 kinds of food
two or more foods
i.e(R and p) + (p and Y) + (y and R) + R and y and
p = 6 + 2 + 4 + 5 = 17
two or more foods
i.e(R and p) + (p and Y) + (y and R) + R and y and
p = 6 + 2 + 4 + 5 = 17