For the first one let Phil's money be and Jill's money be
The two equations you get from this information are:
Solve these equations simultaneously to get the solutions.
Can someone help me put this into equations and solve them:
1. Phil has $150 and three-quarters of what Jill has, and Jill has $100 and half of what Phil has, so how much have each?
2. If a teacher can place her students four to a table, there will be three students on the final table. But, if five children are placed on each table, there will be four students on the the last table.
What is the smallest number of children the class could have?
How do you determine to multiply by 8 and 4? To bring the fractions to integers?
I was trying with substitution, but when multiplying out the first line (before multiply x 8) I would get the wrong answer. As a side question, why doesn't that work?