Hi,

kate worked 10 hrs fewer than dave  hrs

 sarah worked 20 hrs more than dave  hrs

Question states***3 siblings committed themselves to volunteer 130 

 (x-10hrs) + (x+20hrs) + xhrs = 130hr

    3x = 120hrs

     x = 40hrs, the number of hours Dave worked.

Kate worked 30hrs and Sarah worked 60hrs

CHECKING our answer***

 40hrs + 30hrs + 60hrs = 130hrs

Wish You the Best in your Studies.



 

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