Answer:
42
Explanation:
You want to know the missing denominator in the equation ...
2/35 = 1/30 +1/x
Solution
Subtract 1/30 from both sides and simplify.
2/35 -1/30 = 1/x
(2·30 -1·35)/(35·30) = 1/x
25/(35·30) = 1/x
1/(7·6) = 1/42 = 1/x
The missing denominator is 42.