How do you solve the problem 1/15 + 1/6

it’s 7/30

Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1.
(115×22)+(16×55)=?
Complete the multiplication and the equation becomes
230+530=?
The two fractions now have like denominators so you can add the numerators.

Then:
2+5/30=7/30
This fraction cannot be reduced.

Therefore:
1/15+1/6=7/30