Problema Solution
Sally found 17 internet websites about sharks. Mark found four of the same websites and five more that Sally had not found. How many different websites about sharks did they find all together?"
What do you think the answer is?
Answer provided by our tutors
17 + 5 = 22
together, they found 22 different websites all together
another way to look at this is that Sally found 17-4=13 websites that Mark did not find and Mark found 5 websites that Sally had not found, therefore they found 13+5=18 unique websites and 4 commonly-located websites