Colin is working to earn some money for a new CD player. On Saturday he earns half as much as he did on Sunday, but twice as much as he did on Friday. During those 3 days he earned $70. How much did he earn each day?
On Friday we can estimate that he earnt $10 so twice as many as that is $20 so on Saturday he could of earnt that much. Finally what is 20 half of? 40 so 10+20+40=$70
