[Question]: There are 20 students in the orchestra and twice that number in the band. There are 12 boys and 16 girls in the choir. If each student only participates in one group, how many students, in total, are there in the orchestra, the band, and the choir?
[Answer]: There are 20 x 2 = 40 students in the band. There are 12 + 16 = 28 students in the choir. In total there are 20 + 40 + 28 = 88 students.
So the answer is 88.

[Question]: James was 2/3s as tall as his uncle who is 72 inches. He gets a growth spurt that makes him gain 10 inches. How much taller is his uncle than James now?
[Answer]: He was 72 * 2 / 3 = 48 inches tall before. He is now 48 + 10 = 58 inches. So his uncle is 72 - 58 = 14 inches taller.
So the answer is 14.

[Question]: Kirill is 14 less centimeters in height than his brother. Together their heights equal 112 centimeters. How tall is Kirill in centimeters?
[Answer]:
Let B = brother's height in cm. Kirill = B - 14. 2B - 14 = 112 cm. 2B = 126. B = 63 cm. Kirill = 63 - 14 = 49 cm. Kirill is 49 centimeters tall.
So the answer is 49.