Ann can swim 20 laps in 8 min. how long will it take to swim 9 laps? show your equations(s).
1 answer:
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Here we have a system of equation like this:
from the first equation we get:
Substitute in the second equation we get:
Substitute i the first equation again we get:
We deduce that:
A is bigger than B.
from the first equation we get:
Substitute in the second equation we get:
Substitute i the first equation again we get:
We deduce that: