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    Question

    How many numbers between 150 and 600 are divisible by

    both 5 and 7?
    A 15 Correct Answer Incorrect Answer
    B 13 Correct Answer Incorrect Answer
    C 12. Correct Answer Incorrect Answer
    D 18 Correct Answer Incorrect Answer

    Solution

    ATQ, Numbers which are multiple of both 5 and 7 are multiples of L.C.M of 5 and 7 i.e. 35 First multiple of 35 between 150 and 600 = 175 = тАШaтАЩ Last multiple of 35 between 150 and 600 = 595 = an Common dierence = 35 = d Let, number of terms = n Using, an┬а= a + (n тАУ 1)d Where 595 = a + (n тАУ 1) ├Ч d Or, 595 = 175 + (n тАУ 1) ├Ч 35 Or, 35n тАУ 35 = 595 тАУ 175 = 420 So, n = (420 + 35) ├╖ 35 = 13

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