Answer:
atleast 52
Explanation:
Given that an employment agency requires applicants average at least 70% on a battery of four job skills tests.
An applicant scored 70%, 77%, and 81% on the first three exams,
Since weightages are not given we can assume all exams have equal weights
Let x be the score on the 4th test
Then total of all 4 exams =

Average should exceed 70%
i.e.

Comparing the two totals we have

Hemust score on the fourth test a score atleast 52 to maintain a 70% or better average.