12 + 11 = 123

a + b = (a-b) followed by (a+b)
Example –
6+4 = (6-4)(6+4) = (2)(10) = 210

Add 1 to the number and multiply the number by it to get the next number

1 * (1+1) = 2
2 * (2+1) = 6
6 * (6+1) = 42
42 * (42+1) = 1806
1806 * (1806+1) = 3263442

Next number will be 3263442

9

Mary

Without pouring out juice from the bottles, each can given 3 and half bottles of juice and a total of 7 bottles
F – full bottle
H – half bottle
E – empty bottle

A – FFF EEE H ( 7 bottles)
B – FF EE HHH (7 bottles)
C – FF EE HHH (7 bottles)

Chill – snowman and boy
frost – tree
mittens – ice on roof
snow – wooden fence
Ice – car
Boot – snow dog

I would go to the barber with the messy hair.
Since there are only 2 barbers in town, they would have cut each others hair.
So the barber with the messy hair did a good job by giving a nice trim to  the barber!

Numbers that have a prime number as the previous and successive number.

List of prime numbers up to 200:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199

4 (coz 3 and 5 are prime)
6 (5 and 7 are prime)
12 (11 and 13 are prime)
so on..

The next 3 numbers will be 138, 150 and 180.

every six chalks, she can get 1 new chalk.
So in 36 days she can get 6 new chalks.
with these 6 chalks she can make 1 more new chalk .

So the chalks will last 36+6+1 = 43 days

GARDEN
BLOOM
FARM
VINE
SEED
DIG