exam Maths Puzzle Numerical Ability

is 3x=5y a linear equation

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exam Other Question

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.
sorry just dont get it, can anyone help, q = square root A over 4, i have to find the value of A.