I am a number. 1/10 of mine plus 1/2 of mine is 30

Question

 It’s fractions and adding 

Answer 1

n/10 + n/2 = 30

 

Once we find and apply the common denominator, we only deal with the numerators.

 

2n + 10n = 600

12n = 600

12n/12 = 600/12

n = 50

Answer 2

50 is the answer . . .

 

Rewriting the question:

 

x/10+x/2=30

x/10+5x/10=30

6x/10=30

6x=300

x=50

 

Checking the answer:

 

50/10=5

50/2=25

25+5=30 so 50 is correct!