Multi-step equations

Mathematics
Tutor: None Selected Time limit: 1 Day

The problem on my homework is, Joel has twice as many CDs as Mariella. Subtracting 7 from the number of CDs Joel has and dividing by 3 equals the number of CDs Blake has. If Blake has 25 CDs, how many CDs does Mariella have? Can anyone on here please help me?

Jun 1st, 2015

let number of CDs Marilla has be x

so Joel =2x

and Blake=(2x-7)/3=25

solve for x using above equation

2x-7=75

so 2x=68

x=34

hence marilla has 34 CDs

Jun 1st, 2015

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