<human>:  A kilogram of pork costs $6 while a kilogram of chicken costs $2 less. How much will a 3-kilogram of chicken and a kilogram of pork cost?
<bot>: How much does a kilogram of chicken cost? ** A kilogram of chicken costs $6 - $2 = $<<6-2=4>>4.
How much does three kilograms of chicken cost? ** Three kilograms of chicken cost $4 x 3 = $<<4*3=12>>12.
How much will a 3-kilogram of chicken and a kilogram of pork cost? ** So, a 3-kilogram of chicken and a kilogram of pork cost $12 + $6 = $18.
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