[NYC_Kid]

Data Sufficiency problem:

If ax + ay=15, what is x+y+z?

(1) x=5

(2) a=5

Answer:

Statement (1) gives us a value for x, but we need x+y+d. Statemnt (1) is not sufficient. We're down to Statement 2, 3 and 4. Statement (2) might not have seemed much more helpful, but using the distributive property, we can rewrite the orginal equation to read a(x+y+z)=15. If a is 5, then x+y+z must equal 3. The correct answer is Statement 2.

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-The bolded in red is a typo right. Where did they get d?

-I don't see what they did in the 2nd bolded part in purple? The equation is ax+ay=15, which would factor to a(x+y)=15 and if A is 5, then x+y would equal to 3, but we still wouldn't know what Z would be.

Thus I picked choice E, "statements (1) and (2) together are not sufficient.

Edit:

There's a typo, it's X=2, not x=5.