math correction

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can someone correct this for me.or teach me if i'm wrong

Statistics. Sam must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75,63, and 68. Write an inequality representing the score that Sam must get on the last test to get a C grade.
Total marks in 3 test 75+63+68 >= 206
Let score in the last test = x
Total score in 4 test = 206 + x
Average in 4 test = A >= (206 + x) / 4
A>= 70

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