Helpers are needed to prepare for the fete. Each helper can make either 4 large cakes or 32 small cakes per hour. The kitchen is available for 3 hours and 20 large cakes and 800 small cakes are needed. How many helpers are required?
A)10 B)12 C)16 D)20 E)24

• In one hour required labour
  20/4+800/3
  5+25=30 labour in one hour
  So in 3 hours labour =30/3=10
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