book Maths Puzzle Numerical Ability

the square of a number exceeds 11 times the number by 312. find the number.

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book Other Question

a total of 50 juniors and seniors were given a math test. 35 juniors contained an average of 80 and 15 seniors contained an average of 70. what was the average score of all 50 students? I am a two digit number. My ones and tens digits are the same. The sum of my digits is 8. What number am I?