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find the answer in the explanation.

Step-by-step explanation:

In the circuit A;

The moment the switch S1 is opened, bulb A, B and C will go off simultaneously because they are all connected in series.

In the circuit B;

If S1 is opened, bulb G and H will both go off automatically while other bulb will still be functioning. The reason behind this is simply because G and H are in series and both bulbs are in parallel to the other bulbs.

Bulb F will follow by going off when switch S2 is opened.

Immediately switch S3 is opened, both bulb D and E will go off simultaneously because they are in series to each other.

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step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15