What word does this rebus represent?

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Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

People make me, save me, change me, raise me. What am I?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

What word is pronounced the same if you take away four of its five letters?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

What goes up but never comes down?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain