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Maths Puzzle
Numerical Ability
5d-(d+3)=(d+2)+7
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what is and how i solve it please with a cherry on top!!!!
2x-3
_____ =4/7
4x-5
Rachel
A student has earned scores of 87, 81, and 88 on the first 3 of 4 tests. If the student wants an average (arithmetic mean) of exactly 87, what score must she earn on the fourth test?