Level 3
An refrigerator, a oven and a TV cost $470. The TV cost $85 more than the refrigerator. The refrigerator cost $55 more than the oven. What was the cost of the oven?
Level 3
Kim has 3 bottles of apple juice. Bottle X holds 400 mℓ more than Bottle Y and Bottle Y holds twice as much as Bottle Z. If Bottle Z holds 600 mℓ of juice, how much does Bottle X hold?