Jawaban:

The third number is: 4,9

Penjelasan:

The total of three numbers is 16. Two of the numbers are 1,2 and 9,9. What is the third number?

So, the number that we're looking for is x and we make an equation:

1,2 + 9,9 + x = 16

11,1 + x = 16  we add all with minus 11,1:

11,1 - 11,1 + x = 16 - 11,1  and then we will get the answer:

x = 4,9

The answer is x = 4,9

We put x = 4,9 in the equation:

1,2 + 9,9 + x = 16

11,1 + (4,9) = 16

16 = 16  It is proven! (Terbukti)

I hope it helps. (Semoga membantu ya)