please help me with my math extra credit…multiple choice:)?
it takes you 12 minutes to weed one flower bed, and it takes your brother 16 minutes to do the same amount of work. how long does it take the two of you to finish weeding if your yard has 7 flower beds?
a) 4 min
b) 28 min
c) 48 min
d) 98 min
e) 196 min
*please explain to me how you got your answer, in order to be chosen as best answer. thanks
call t the time it takes to complete on flower bed
you complete t/12 of the task in one min, your brother completes t/16 of the task in 16 mins, so it takes
t/12+t/16=t mins to complete one flower bed
divide by t:
1/12+1/16 = 1/t
4/48+3/48=1/t
7/48=1/t or t=48/7 mins
to complete 7 similar flower beds takes 7×48/7 = 48 mins
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