Sonny needs 40 minutes to assemble a cabinet. Tito needs 20 minutes to assemble the same cabinet. How long will it take them to assemble a cabinet if they work together?
and
A hot air balloon changes its altitude to 2 200 feet in 50 minutes. what is the rate of change in altitude?
Math problem 3 i need your help to pass 7th grade please?
1st question: Same as the first answerer said. You need to find how many cabinets they can make in 40 min divided by the amount of cabinets they made. So:
Sonny = 1/40 Tito = 1/20 or 2/40 (add them)
Total = 3 cabinets in 40 minutes so 40/3 = 13.3 min
2nd Question: You need to find the feet which the balloon flies up per minute. So you go
2200/50 = 44 feet per minute or 44f/min
Math problem 3 i need your help to pass 7th grade please?
1/40+1/20= 3/40 ( 1 min work)
therefore in 40/3 mins they 'll complete the work ( reciprocal)
2nd ?
work problem!
x/40+x/20=1
(x+2x)/(40)=1
3x/40=1
x=40/3
or
x=13.333333333......mins.
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simply divide
2 200/50=44 feet per minute
its like distance problem
d=rt
r=d/t
t=d/t
