What value of z makes the equation true? 0.2z -8 =0.4z -7
1 answer:
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Answer:
C. 3.33 hours
Step-by-step explanation:
Use the algebra work equation:
=
+
, where tb is the time to work together, t1 is the time it takes one person, and t2 is the time it takes the other person
Plug in the values we know:
=
+
=
+
=
20 = 6tb
3.33 = tb
So, it would take them 3.33 hours when working together.