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Total 25 strings  each of 12 cm is obtained from the given strings.

Step-by-step explanation:

The given length of the three strings are : 60 cm, 72 cm  and 168 cm

On Prime Factorization of the given terms, we get:

60 = 2 x 2 x 3 x 5

72 = 2 x 2 x 2 x 3 x 3

168 = 2 x 2  x 2 x 3 x 7

The common factors to all these three terms is   2 x 2 x 3  = 12

So, from each string  strings of length 12 cm can be cut.

Now, 60 ÷  12 =  5

So, 5 strings of cut from this of equal length.

72 ÷  12 =  6

So, 6 strings of cut from this of equal length.

168 ÷  12 =  14

So, 14 strings of cut from this of equal length.

⇒Total number of strings of 12 cm =  5 + 6 + 14 = 25 strings

Hence, total 25 strings  each of 12 cm is obtained from the given strings.