DS Question

[ChristineG189]

Please explain data suff problem #147 from OG 2016. I do not understand the explanation for answer 1 being correct. How does the hundreds digit of x equal the sum of z + y in all cases? What if the hundreds digits of y and z are both 5? Then the hundreds digit of x is 0, not the sum of z and y.

[RonPurewal]

please read the forum rules -- we can't discuss or reproduce OG problems on here (per the explicit request of GMAC). thanks.