The equation is 3.05÷0.05=61
I have no idea, but the only thing that comes to mind, is the fact, 80+20=100 and you need to find the value of 70 which can be taken out of the 100 .. but simply the 20% has a variable. Find a way to use that.
(AB)^2 + (2 m)^2 = (8 m)^2, or
(AB)^2 + 4 m^2 = 64 m^2, or (AB)^2 = 60 m^2.
Taking the square root of both sides, (length of AB) = + 2sqrt(15) (answer)
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We can expect about 193 earthquakes.
Hope this helps.
No,Yes,No,Yes (the answers in order)