Let J be the number of books that Jonson has and let M be the number of books mandy has.
now solve them simultaneously. Can you do that?
What do you get for M and J?
Where are you getting these word problems
I have solved both of your two questions. But I couldn't solve the last one.
it was hard to solve. But I hope this helps
X - number of books Johnson has
Y - number of books Mandy has
X - 5 = Y + 5 X = Y + 10
3(Y-4) = X + 4 3Y - X = 16
Substitute X in the second equation by (Y+10):
3Y - Y - 10 = 16
2Y = 26
Y = 13 books Mandy has
13 + 10 = 23 books Johnson has