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one way to do these is to first work out what fraction of the building does each one paint in one hour Ted does whole building in 11 hours so in 1 hour he does 1/11 of building similarly Linda does 1/8 of building in i hour So working together they do 1/x of the building in one hour where x = time to do the whole building when they work together so can you see which option is correct?
you have 1/11, 1/8 and 1/x
So it's D?
1/7 + 1/4 = 1/x solve for x
the 4th option is correct... this is an example of Time & Work... check similar examples in your textbooks or on the internet @KittyT.
From the equation of @welshfella . I got the answer is 28/11 = 2.5 (like my answer)
@mathmate Which one are you agree with?
yes tha'ts correct it actually comes to 2 6/11 but they asked for an approximate value
7... since for b = 7 the left hand side becomes infinity
So I got it?
btw... are these questions part of assignments from your school? just asking