Solution:

The answer to the riddle is "coffee."

"I can roast, yet I'm not turkey": Coffee beans are roasted to create the flavorful coffee we drink, but this line emphasizes that despite being roastable, it's not a turkey being referred to.

"Grindable, but not pepper, quirky": Coffee beans are commonly ground to make coffee grounds, similar to how pepper is ground for seasoning. The line adds a playful twist by mentioning that it's not referring to pepper.

"Pressing's an option, no button's plea": This refers to the process of making coffee using a French press, where coffee grounds are steeped in hot water and then pressed down. It clarifies that while pressing is involved, it's not about pressing a button.

"Brewing's my game, not beer, agree?": Coffee is brewed to make the beverage we enjoy, but here it clarifies that it's not referring to brewing beer.

"A bean, not magic, plain to see": Coffee comes from coffee beans, but the riddle emphasizes that despite being a bean, it's not magical in nature.

Solution:

The young lady was presented with a bill which belonged to the elderly woman. She had asked the waiter to collect the bill from her daughter.

Solution:

111111111

Explanation:
It's a maths magical square root series as :
Square root of number 121 is 11
Square root of number 12321 is 111
Square root of number 1234321 is 1111
Square root of number 123454321 is 11111
Square root of number 12345654321 is 111111
Square root of number 1234567654321 is 1111111
Square root of number 123456787654321 is 11111111
Square root of number 12345678987654321 is 111111111 (answer)

Solution:

The Lady sitting in the chair has the detector attached to the back of her blouse.

Solution:

The bridge won't break.

When the car has travelled half of the bridge, that is 15km, the car must have used more than 300 grams of fuel. Therefore, the impact of bird's added weight will be zero literally.

Solution:

The two numbers are 4 and 13 whose product is 52 and sum is 17.

Solution:

192 021

If you look at it as two-digit numbers you'll see:10 11 12 13 14 15 16 17 18 19 20 21

Solution:

7, 4, 6, 5, 8

Solution:

Q = 1
U = 9
I = 6
C = 8
K = 3.

Explanation:
Replace values in( Q + U + I + C + K)^3 = QUICK
(1+9+8+6+3)^3 = 19863
27^3 = 19863
19863 = 19863

Solution:

It will take the man 58 minutes to reach the top.

Since he is climbing 3 feet and falling 2 feet back every passing minute, he is actually climbing 1 feet every minute.
Therefore, he would have climbed 57 feet in 57 minutes. The remaining distance is 3 feet. He will take one more minute to climb it and reach the surface. Since he has reached the top surface, he won't slip back.

Solution:

Selfie
Explanation:
: Selfie = is six letter word
: Self = The first four letter is me.
: e = The second and last letter are the same.
: fee = The fourth second and last letter are payment.