exam Maths Puzzle Numerical Ability

How many lbs of Brazilian coffee costing $6.00 per lb must be mixed with how many lbs of columbian coffee costing $4.00 per lb to produce 36 lbs of a mixture costing $4.50 per lb?

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smith has 3 times as much money invested at 8% bonds as he has in stocks paying 9.5%. how much does he have invested in each if his yearly income from the investments is $6365 ? 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 }}}