exam Maths Puzzle Numerical Ability

2. r/2-8+=-4 solve the equation




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Mr.Nelson lost one of his students test papers. He knos thar thre other 4 students scored as follows: 12,20,21,12. He know that the average score is 19.4.What the score on the missing paper. the sum of the solutions to 49x^2-25 is? thank you