Bunuel wrote:

Todd's construction company is capable of building 40 houses a year. Todds brother Mike also owns a construction company. How long does it take the two companies together to build 64 houses?

(1) Mikes construction company is capable of building houses twice as fast as Todd's company does.

(2) Mike's construction company is capable of building 20 houses every three months

given tod builds 40 houses a year

so per month 40/12= 3.3 houses per month

from 1 :

rate of Mike is 2* tod rate = so mike rate = 2 * 3.3 = 6.6 houses per month

we have both rates now we can find time for 64 houses

sufficient

from 2 : mike can build 20 houses every three months ; per month 20/3= 6.6

same info as we got instmt1

sufficient

IMO D

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