I got 5,300. I’m not sure if that’s what you meant for “d”.
The answer is 30
2 * 15 = 30
5 * 6 = 30
30 is between 24 and 34
1 container = 55 balls
x 9 x 9
9 containers = ? balls
55 x 9 = 495
<u><em>The answer is 495 balls</em></u>
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I and III seem to be correct, II doesn't because, for example, if x = w = z = t = 70 and y = u = 40, then all three pairs of vertical angles in the figure have equal measure and the given condition x + y = u + w stands. But it means y is not equal to w.