1. Product of 5r and 7 divided by 15
   
2. 120% of the sum of w and one-twelfth u
   
3. 20% of one half w
   
4. Sum of x, three-fourths x, and 90% of z.
   
5. Four times the difference of one-half x subtracted from three-eighths y.
   
6. 60% of the difference of five-eighteenths v subtracted from four-sixths w.