How many minutes he does arm routine and abdominal routine

Question

asked Feb 22, 2018 84.1k views

1 Answer

Okcoker · Answer 1 · 2018-02-27T07:14:46+0000

Let

be the amount of time it takes to perform an arm routine and

be the amount of time it takes to perform an abdominal routine. We see:

4x+y=70

Subtracting the second equation from the first gives
y=30

. Substituting gives
4x+30=70

, so

and

.

Thus, an arm routine takes ten minutes and an abdominal routine takes thirty minutes.