In the kinder-gardens.

YELL-oohhhhhhh...

235
(x*2-1, *2+1, *2-1 …)

They actually spent $25 + $2 tip = 27 and got back $1 each which = 30. In the first equation, the tip is part of the $27 dollars, but then calculated again instead of the $3 they got as change.

At the time she went into labor, the mother of the twins was travelling by boat. The older twin, Terry, was born first early on March 1st. The boat then crossed the International Date line (or any time zone line) and Kerry, the younger twin, was born on February the 28th. In a leap year the younger twin celebrates her birthday two days before her older brother.

I have a lot of problems!

280

I am stuck on you!

To make up his mind.

The question talks about great grandchildren, not great-grandchildren. The hyphen makes all the difference. The grandchildren were great, top, brilliant and awesome, but childless.

He is a pilot in the cabin of the airplane.

2.

11 o'clock plus 2 hours = 1 o'clock 9 o'clock plus 5 hours = 2 o'clock