in a group of 100 people , 60 like volleyball , 50 like hockey . how many like both volleyball and hockey ?
"make a venn diagram , and enter your data . let the number of people who like both volleyball and hockey be x 60 - x + x + 50 - x = 100 x = 10 so number who like both volleyball and hockey = 10 answer c"
add(add(50, subtract(60, 50)), 50)