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Which of the following is equal?

This topic has 3 expert replies and 0 member replies
datonman Senior | Next Rank: 100 Posts Default Avatar
Joined
28 May 2014
Posted:
53 messages

Which of the following is equal?

Post Tue Sep 22, 2015 12:13 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hello, the problem is as follows. Please note: I have an answer to this particular question.

    If 893 X 78 = p, which of the following is equal to 893 X 79?

    P+1
    P+78
    P+79
    P+893
    P+894

    The answer to this question goes along the lines of

    893 x 79 = 893 x 78 + 1 and etc... But is there another way to get this question?

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    Post Tue Sep 22, 2015 12:29 pm
    You could also use units digits. If P = 893 *78, P will have a units digit of 4. (3*8 = 24.)
    893 * 79 will have a units digit of 7. (3 * 9 = 27.)

    So the correct answer must have a units digit of 7.

    D : P + 893, and P has units digit of 4, so P + 893 will have a units digit of 7.

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    Post Tue Sep 22, 2015 1:00 pm
    datonman wrote:
    If 893 x 78 = P, which of the following is equal to 893 x 79?

    A) P+1
    B) P+78
    C) P+79
    D) P+893
    E) P+894
    Here's the solution you referred to:

    Given: 893 x 78 = P

    893 x 79 = 893 x (78 + 1)
    = (893)(78) + (893)(1)
    = P + 893
    = D

    Cheers,
    Brent

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    Post Thu Sep 24, 2015 10:18 am
    893 * 79 =

    893 * (78 + 1) =

    893*78 + 893*1 =

    p + 893*1 =

    p + 893

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