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Which of the following is equal?

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datonman Senior | Next Rank: 100 Posts Default Avatar
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Which of the following is equal?

Post Tue Sep 22, 2015 12:13 pm
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 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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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

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Brent

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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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