Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What word is represented by this rebus?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

There are 100 bulbs in a room. 100 strangers have been accumulated in the adjacent room. The first one goes and lights up every bulb. The second one goes and switches off all the even-numbered bulbs - second, fourth, sixth... and so on. The third one goes and reverses the current position of every third bulb (third, sixth, ninth? and so on.) i.e. if the bulb is lit, he switches it off and if the bulb is off, he switches it on. All the 100 strangers progress similarly.

After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?