book Maths Puzzle Numerical Ability

(4-1/2c)-1/3[3/4(1-2c)]=1/12c

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Hi Tutors, it's me again I need help with the following problems can you help me. Thank you so much.

y=3x+2

x=5x

y=2x+1 How many pounds of candy selling for $5.80 per pound should be mixed with 7 pounds of candy selling for $2.40 per pound to obtain a mixture selling for $3.42 per pound?