exam Maths Puzzle Numerical Ability

Write an equivelent variable expression: -5(4j-1)

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exam Other Question

x+2y+z=3
2x-3y+2x=-1
x-3y+2z=1 Sam must have an average of 70 or more in his summer course to obtain a grade of C. Her 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.