The substance in the pile is gradually blown away by wind. How much of the substance is left by 3pm Thursday?

1) The wind blows away 4 kilos of substance each hour

2) At 5am Tuesday there were 5 tonns of substance in the pile

(A) Statement 1 alone is sufficient, but statement 2 alone is not sufficient

(B) Statement 2 alone is sufficient, but statement 1 alone is not sufficient

(C) Both statements together are sufficient, but neither statement alone is

sufficient

(D) Each statement alone is sufficient

(E) Statement 1 and statement 2 together are not sufficient

I answered C.

OA is E....

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When you come to the end of your rope, tie a knot and hang on.