numbers and letters quiz

[marbil]

5. 4 s on a v
7. 2 u in a g of c
8. 86 k on a p
10. 2 u p is an e in g
11. 24 o in a p
14. 3 w on a r r
15. 1979 m t e f w pm
20. 13 e in a b d
26. 206 b in a h s
29. 26 m in a m
30. 3209 f to the t of s p

[gen2]

10. 2 Under Par is an Eagle in Golf

[gen2]

14. 3 Wheels on a Robin Reliant

[squarebear]

4 strings on aviolin
2 umpires in a game of cricket
86 keys on a a piano (this should be 88 really though)
2 under par is an eagle in golf
???
3 wheels on a reliant robin
???
13 (eggs, elelphants or anything) in a baker's dozen
206 bones in a human skeleton
26 miles in a marathon
3209 feet to the top of Scafell Pike

[gen2]

20. 13 E???? in a baker's dozen

[squarebear]

1979 margaret thatcher elected first woman prime minister

[FoxLee2]

As the piano one is wrong, could there be a mistake in No.11. Possibly referring to ounces in a pint but having 24 instead of 20.