question: An eraser costs $2 and a pencil costs $3. How much do 6 erasers and 8 pencils cost?
answer: Six erasers cost $2/eraser x 6 erasers = $<<2*6=12>>12.
  Eight pencils cost $3/pencil x 8 pencils = $<<3*8=24>>24.
  So, 6 erasers and 8 pencils cost $12 + $24 = $36.
  #### 36