help!!!!!!!!!!!!!!
Megan exercises every morning for 40 minutes. She does a combination of step aerobics, which burns about 11 calories/min and stretching which burns about 4 calories/min. Her goal is to burn 335 calories during her routine.

How long should she participate in each activity in order to burn 335 calories?
a.
20 min aerobics
20 min stretching
c.
22 min aerobics
18 min stretching
b.
30 min aerobics
10 min stretching
d.
25 min aerobics
15 min stretching

Question

help!!!!!!!!!!!!!!
Megan exercises every morning for 40 minutes.  She does a combination of step aerobics, which burns about 11 calories/min and stretching which burns about 4 calories/min.  Her goal is to burn 335 calories during her routine.

How long should she participate in each activity in order to burn 335 calories?
a.
20 min aerobics
20 min stretching
c.
22 min aerobics
18 min stretching
b.
30 min aerobics
10 min stretching
d.
25 min aerobics
15 min stretching

anonymous · Answer

a=aerobics
s=stretching
335=11a+4s
-11a  -11a
335-11a=4s
divide both side by 4
83.75-2.75a=s
335=11a+83.75-2.75a
335=8.25a+83.75
-83.75     -83.75
251.25=8.25a
divide both sides by 8.25
30.45454545454545=a

anonymous · Answer

its d