Two times a number plus three equals one half of the number plus 12. what is the number?

We'll use n as "the number". 2n+3=1/2n+12. Step one is to isolate the variable.
2n-1/2n is 1.5n.
1.5n+3=12.
Subtract 3 from both sides.
1.5n=9.
n=6.

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On monday,mrs.wise bought 3 lbs of apples at $4per lb= 4*3=$12on tuesday ,20%off and she buy 5 lbs of apples = $4-20%=3.20*5lb=$16example: other wise when she buy 5lbs on monday she have to spend 4*5=20