In a group of 15 , 7 have studied Latin , 8 have studied Greek, and 3 have not studied either . How many of these studied both Latin and Greek ?
- 0
- 3
- 4
- 5
Answer: 3
Explanation: ( 7 – x) + x + ( 8 – x) + 3 = 15
18 – x = 15
x = 18 – 15
x = 3