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Joe studied the sketch. “Just a circular lawn,” he said, “made up of a ring of turfing and a circular flower bed. For a lawn five times the diameter of the flower bed, I’ll quote £40 for the turfing.” “What if we reduced the overall diameter of the lawn by a foot, but increased the flower bed’s diameter by one foot?” asked Charlie. Joe smiled. “Same rate and strictly by area. It would be £35 instead.” What was the original planned diameter of the lawn?
Lawn diameter 20 feet
Lawn diameter 18 feet
Lawn diameter 24 feet
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