exam Maths Puzzle Numerical Ability

Can you teach me how to solve this problem.
The sum of three numbers is 105. The third is 11 less than ten times the second. Twice the first is 7 more than three times the second. Find the numbers.

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exam Other Question
The principal is $2,200. at 12% compounded semi-annually for 2 years. Determine the amount at the end of 2 years. 1-solve by graphing x-y=5

2- x+y=3

3- x+2y<_ 3

4-x+y> 2