exam Maths Puzzle Numerical Ability

suqare root 2u+10-2 square rootu=10

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exam Other Question

solve the following of linear inequality by graphing
3x-y<2
x+y>2
please dear tutors help a struggling young lady who is at her wits end with this problem. 561 students, girls are 15 more than twice the number of boys.
how many girls are there and how many boys. this is not from a text book. I did it this way.
2x+15=561 but my answer did not seem right, there is something I am missing.