As with life, it just takes a small change in orientation to see what cannot be seen. Once seen, clear as water.
Oh damn! It took me all damn morning and then it was stinking obvious! Its how you look at the numbers. 87
This problem helps gauge the capacity that a student has for detecting/analyzing information. This has nothing to do with math. ....... ....... .......
That shouldn't be considered a math question- but its a good way to gauge the skills of children fpr admission. And we wonder why their scores are radically better than ours. While our kids are busy memorizing spongebob quotes and playing gameboy- theirs are learning english and critical thinking skills.
It took me much longer than I care to admit, but now I see it. Hint: Start from right, and move left.