PSLE math question - any smart samster can solve?

[Jalan Kayu]

 

[creampie]

XY is 5cm

 

[bobby]

This knowledge is very important to your work life…

 

[A Singaporean]

I ask my friend from Uptron. Answer is 9 cm. They learned this in Kindergarten.

 

[bigozt]

Answer is 69 for the cheebye teacher.

Real world application for such shit?

Probably have the surveyors go out and measure properly. Fail

 

[A Singaporean]

UPTRON LUMBAR ONE. NUS NO ANSWER ?

 

[ftan42]

nine cm