The doctor has challenged Mr. Jonas, who weighs 240lbs to achieve his ideal body weight of 186 lb by losing no more than 3 lb/week. How many weeks will it take for Mr. Jonas to achieve his ideal weight following his doctor's orders?
Let number of weeks for her to lose the weight, be W
Then we get:
Therefore, number of weeks for her to lose weight, or W ≥ 18.