ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!


    тЪб Month End Offer - Flat 52% Off On All Courses! Enroll Now тЪб
    00:00:00 AM Left

    Question

    The sum of the total surface areas of two cubes is 1452

    cm2. If the product of the length of their edges is 103 cm2, then find the difference (in cm) between the lengths of their edges.
    A 4 cm Correct Answer Incorrect Answer
    B 6 cm Correct Answer Incorrect Answer
    C 5 cm Correct Answer Incorrect Answer
    D 7 cm Correct Answer Incorrect Answer
    E 8 cm Correct Answer Incorrect Answer

    Solution

    Let the length of the edges of the two cubes be тАШaтАЩ cm and тАШbтАЩ cm, respectively According to the question, 6a2 + 6b2 = 1452 Or, a2 + b2 = 1452/6 = 242 And, ab = 103 Using the formula, ┬а x2 + y2 = (x тАУ y)2 + 2xy 242 = (a тАУ b)2 + 2 ├Ч 103 Or, (a тАУ b)2 = 242 тАУ 206 Or, (a тАУ b)2 = 36 Or, a тАУ b = ┬▒6 So desired difference = 6 cm┬а

    Practice Next
    More Mensuration Questions
    ask-question