a:b is usually read as a ratio. (It can also be read as "odds"; e.g. the odds of winning a sweepstakes prize is listed as 100,000:1 or 100,000 to 1.)

Assuming this is a ratio:

(1) We can read this using order of operations. We treat the ":" symbol as a grouping symbol.

Then (13+4)+20:5 is `(13+4)+20/5=17+4=21`

(2) If by the context of the problem we wanted the ratio of the left side to the right side we have:

[(13+4)+20]:4 or 37:4 which can be written as `37/4,8 3/4,8.75`

**QUESTION:-**

( 13 + 4 ) + 20 : 5

**SOLUTION:-**

**According to the system of operations the ':' sign is basically used as a division '/' sign, Therefore,**

**(13+4) + 20:5**

Put division sign (/) instead of ratio sign (:)

= (13+4) + 20/5

Since 20/5 = 4, Hence;

= 13 + 4 + 4

= 21

Hence Solved.

The answer to this problem is 21

Therefore;

(13+4) + 20:5 = 21

( 13 + 4 ) + 20 : 5

To solve this follow the system of operations, where the "is to" sign i.e. ":" is ratio can be solved by division, so write it like this,

( 13 + 4 ) + 20 : 5

13 + 4 + 20/5

17 + 4

**21 Answer.**