Question
Eric is twice as old as Ernest, who in turn is 5 years older than mike.if their total age is 47 years, how old is each of them?
Answers
PsyDAG
M = Et - 5
Er = 2Et
Er + Et + M = 47
Substitute Et-5 for M and 2Et for Er in the third equation and solve for Et. Insert that value into the other equations to solve for M and Er. Check by putting all values into the third equation.
Er = 2Et
Er + Et + M = 47
Substitute Et-5 for M and 2Et for Er in the third equation and solve for Et. Insert that value into the other equations to solve for M and Er. Check by putting all values into the third equation.