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Maths help me plz.20點!!方程式

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方程式(請提供埋步驟) 1)4分3x+5=5分7x-8 2)30-7分4x=5分(150-10x) 3)A cash voucher,either$200 or$300,is given to each of 45 staff members.If the total amount of these vouchers given is$11800,find (a)the number of staff members receive a $200 voucher. (b)the number of staff members receive a $300 voucher.

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1)4分3x+5=5分7x-8 =>3x/4+5=7x/5-8 =>(20+3x)/4=(7x-40)/5 =>(20+3x)*5=(7x-40)*4 =>100+15x=28x-160 =>13x=260 =>x=20 2)30-7分4x=5分(150-10x) =>30-4x/7=(150-10x)/5 =>(210-4x)/7=(150-10x)/5 =>1050-20x=1050-70x =>x=0 3)A cash voucher,either$200 or$300,is given to each of 45 staff members.If the total amount of these vouchers given is$11800,find =>200x+300(45-x)=11800 =>200x+13500-300x=11800 =>100x=1700 =>x=17 (a)the number of staff members receive a $200 voucher. =>17 (b)the number of staff members receive a $300 voucher. =>45-17=28

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