Random Puzzles 

Workings

Hint
A tricky base 8 question.

Answer
61.

Each term is a square expressed in base eight, 7 2=49 = 61 in base 8.

Workings

Hint
Each sentence hides a single word.

Answer
Badgers rapidly excavate a mound.

Reasoning
The initial letters of the words spell BREAM, a fish. The other sentences all spell birds.
SWAN  = Sam wanted another newt. EAGLE = Every artistic giraffe likes elephants. BREAM = Badgers rapidly excavate a mound. WREN  = Wild rabbits enjoy nature. DUCK  = Dale understood cute kittens. CRANE = Casual restless aardvarks need exercise.

Workings

Answer
All of them!

Workings

Hint
Do leap years make a difference?

Answer
Hours in 10 years.

Reasoning
In a day, there are 60 x 60 x 24 seconds = 86,400 seconds.

In 10 years, there are 10 x 365 x 24 hours = 87,600 hours, which even without the leap years is already the larger number.