Dear Jays Darlin
Here is another way of working out the answer. I have used **** because I cannot produce columns. Of course in the real test, we do not use rulers for perfect lines, its a quick drawing.
Daniel, Gary, July, Jade and Mandy, who are aged 14, 13, 12, 12, 11... but not neccessarily in that order.
Daniel is 2 yrs younger than Jade
Gary is 2 years younger than July,
Mandy is older than Daniel,
Which of them are the same ages?
A Gary, and Daniel
B Gary and Mandy
C Daniel, and Mandy
D Daniel and Jade
E Gary and Jade
You need 2 columns, to show each possibility. Daniel is 2 years younger than Jade, this could be 12 and 14 or 11 and 13. First column would show Daniel as 12 and Jade as 14, the second column would show Daniel as 11 [because 12 has already been used] and Jade as 13 [because 14 has already been used]
The same idea is used for Gary and July. The Ist column, Gary is 11 [because 12 already used] July would be 13 [because 14 already used] Second column Gary would be 12, July would be 14
As the original information gives 2 x 12 and we have only used 1 x 12, in each column, Mandy must be 12 in both columns.
D / 12 **** 11
G / 11 **** 12
Ju/ 13 **** 14
Ja /14 **** 13
M / 12 **** 12
We are told Mandy is older than Daniel, therefore column 2 must be the correct one [column 1 she is the same age] Leaving Gary and Mandy as the same age.
I like these Zs. Like many of my students, we wish the whole test consisted of Zsssss.