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## Find the missing number

Posted by Chris on January 31, 2015 – 4:25 pm

A Mr. Piyush has posted the following:

Find the missing number

5 : 24 :: 8 : x

Options are:
a. 65
b. 63
c. 62
d. 64

This post is under “Tom” and has 7 respond so far.

### 7 Responds so far- Add one»

1. 1. Zorglub Said：

63

2. 2. Wizard of Oz Said：

5^2 – 1 = 24
8^2 – 1 = 63

3. 3. DP Said：

Same.
I came up with (b) using the same logic as Wiz

4. 4. KK Said：

Man what base please or it is impossible to know

5. 5. Ruby Said：

I agree don’t follow that person cause he posts nonsense don’t wast my time what is :: there is no such symbol but there is in System Base x : y : z if so don’t post useless kind of riddle

6. 6. Chris Said：

Ruby. In math a:b :: c:d reads, a is to b as c is to d or more fully: the ratio of a to b is the same as the ratio of c to d. In modern terms a/b = c/d

It is disappointing that Mr. Plyush didn’t provide a solution.

7. 7. DP Said：

You can also use it as a similarity.
For example,
Period : Sentence :: Question Mark : Question
Read, “Period is to sentence, as Question mark is to question.”