Statement This time, again, the comments I have removed much of the work.
The first question is simple. Indeed, as Matthew has to climb 12 stories, half of road has risen 6, if in the 8 th game is that it has 2, so that Clara must live in the 14 th, that is the answer (c).
The second response, M = 1000 and CD = 400 (since C is 100 and D 400). Since XL = 40 (similar), IX = 9. So we have to MCDXLIX = 1449. Corresponding to the response (a).
Solve the third question is more complicated. In reality, we need to find out what it's worth every letter, and as we have the products of each pair is for me and try to factor it easier to multiply and divide quickly head. Thus, xy = 2 * 3 * 3, xz = 3 and z = 3 * 2. If we multiply the second by the third equality, we have x * y * z * z = 3 * 3 * 2, and if we divide by the value of x * and also have it, is that z * z = 1, ie z = 1, being positive . Quickly obtain that x is 3 and y is 3 * 2 = 6. Ie x + y + z = 10, response (b).
Another approach (faster) could be that since xz = 3 yxyz are positive integers, or x = 3 and z = 1, where y = 6 (and the sum is what we have said), or x = 1 and z = 3, but in this case, and should be worth 2, and could not assert x 18. Therefore, we only have the solution (b).
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