SOLUTION: A certain array of solar cells can generate 6.0 GJ in 5.0 months (under standard conditions). After this array has been operating for 3.0 months , another array of cells is adde

Question 1055496: A certain array of solar cells can generate 6.0 GJ in 5.0 months (under standard conditions). After this array has been operating for 3.0 months , another array of cells is added which alone can generate 15.0 GJ in 7.0 months . How many additional months, after the new array has been added, is needed for the total energy generated from both arrays to be 30 GJ ?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Find the rate of both arrays,

and

So after 3 months, array 1 has generated,

So then both together need to generate X to reach 30.

So then together,

or approximately 7.9 months.
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