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Smiths have driven 400 miles which is 5/8 of their trip how much further they have to drive

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1 Answer

First, let's translate this into an equation.
 
400 is 5/8 of what number?
 
The missing number in this equation is the total trip miles.
 
400 x 8 is 3200
3200 divided by 5 is 640
 
640 is the total trip miles.  Now we can take 3/8 of the 640 or we can just subtract 400 from 640.
 
640 minus 400 is 240.  Let't check our answer.
 
640 times 3 is 1920.  1920 divided by 8 is 240.
 
How much further do they have to drive?  The have to drive 240 more miles.