Dwarfs

Four dwarfs would prepare firewood for Snow White in 580 minutes. After an hour and a half, they recruited friends and finished preparing the wood for 280 minutes. How many dwarfs do they recruit?

Final Answer:

x =  3

Step-by-step explanation:

t1=1.5 h min=1.5 60  min=90 min t2=280 min t3=580 min  t1 4+t2 (x+4)=t3 4 90 4+280 (x+4)=580 4  280x=840  x=280840=3  x=3



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