[Question]: From Monday to Friday, Elle practices piano for 30 minutes. On Saturday, she practices piano three times as much as on a weekday. There is no practice on Sunday. How many hours does Elle spend practicing piano each week?
[Answer]: From Monday to Friday, Elle practices 0.50 x 5 = 2.5 hours. On Saturday, she practices 0.50 x 3 = 1.5 hours. Each week, Elle practices piano for 2.5 + 1.5 = 4 hours.
So the answer is 4.

[Question]: $240 was divided between Kelvin and Samuel. Samuel received 3/4 of the money. From his share, Samuel then spent 1/5 of the original $240 on drinks. How much does Samuel have left?
[Answer]: Samuel received 3 / 4 of $240, which is $240 * (3 / 4) = $180. He spent 1 / 5 of $240, which is $240 * (1 / 5) = $48. He spent this amount from his own share, so he has $180 - $48 = $132 left.
So the answer is 132.

[Question]: Charley bought 30 pencils. She lost 6 pencils while moving to school, and of course, also lost 1/3 of the remaining pencils because she wasn't very good at keeping track of pencils. How many pencils does she currently have?
[Answer]:
If Charley bought 30 pencils and lost 6 while moving, she remained with 30 - 6 = 24 pencils. Because she isn't good at keeping track of her pencils, Charley lost 1 / 3 * 24 = 8 more pencils. She currently has 24 - 8 = 16 pencils.
So the answer is 16.