What can be measured but has no length, width or height?

Answer: temperature

Solution:

When a girl was 7, her sister was 14, now the girl is 10. How old is her sister now?

Answer: 17

Solution:

Correct Answer: 17

Condition 1: 

Girl age = 7

Sister age = 14

So here age difference is 7 years

Condition 2:

Girl age =10

so Sister age = Girl age + 7=10+7=17

Hence Sister age is 17

What’s the least number of chairs you would need around a table to sit four fathers, two grandfathers, and four sons?

Answer: Four. The four fathers could be grandfathers and are definitely sons already.

Solution:

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Four. The four fathers could be grandfathers and are definitely sons already.

I am too much for one but not enough for two. Give me to a third and I am gone. What am I?

Answer: secret

Solution:

I can’t be bought, but I can be stolen with a glance. I’m worthless to one, but priceless to two. What am I?

Answer: Love.

Solution:

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Love.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Answer: A die (dice).

Solution:

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A die (dice).