exam Maths Puzzle Numerical Ability

Please help me solve for a for this equation: {{{ 7.5a+.5b-3.5c=6.5 }}} {{{ 2.5a-3b+4c=5 }}} {{{ 1.5a-5b+2c=-11 }}}

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exam Other Question

The length of the rectangle is 3 times its width. The perimeter of the rectangle is 160 ft. Find the length and the width of the rectangle. Solve the problem algebraically. A stamp collector has 4 cent, 3 cent and 2 cent stamps. If he has 3 more 3 cent stamps than 4 cent stamps and 4 less 2 cent stamps than 4 cent stamps and the total face value is 64 cent, how man of each kind has he in his collection?