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# Science Week: The answers so you can enjoy your Friday night

Have you been taking part in our Brainteaser series? See how many you’ve got right.
Nov 14th 2014, 6:00 PM 9,905 7

EVERY DAY DURING Maths Week, we came up with a little puzzle to wreck your head.

And the scientists of Ireland wanted in. So to celebrate Science Week, which launched last Sunday, we came up with a different brainteaser for you each evening this week.

But we didn’t want to ruin your Friday – or the rest of the weekend. So here are all the answers.

### Monday

Question: You have a string-like fuse that burns in exactly one minute. The fuse is inhomogeneous, and it may burn slowly at first, then quickly, then slowly, and so on. You have a match, and no watch.How do you measure exactly 30 seconds?

Light the fuse at both ends.

### Tuesday

Question: I am a chemical symbol for an element.This element was discovered in 1824.I am a Spanish word without the accent. Reverse me so I become a form of a common verb. What symbol am I?

Si for silicon.

### Wednesday

Question: How can you throw a ball as hard as you can and have it come back to you even if it doesn’t hit anything, there is nothing attached to it and no one else catches or throws it?

Throw it straight up into the air.

Question: You’re a farmer and you’re going to buy some animals. At the market you can buy: Horses for €10 each, goats for €1 each and a bunch of 8 ducks for €1.

The aim is to acquire 100 animals at the cost of €100, what is the combination of horses, goats and duck that allows you to do this? (You must buy at least one of each.)

7 horses, 21 goats and 9 bunches of ducks.

### Thursday

Question: You have to get a bag of grain, a chicken and a fox across a river. You are only able to bring one item over at a time.How do you get all three items across safely, without the fox eating the chicken or the chicken eating the grain?

Take the chicken across.
Come back with the boat empty besides yourself.
Take the grain across.
Take the chicken back.
Take the fox across.
Come back with the boat empty besides yourself.
Take the chicken across.

Question: On what three parts of the body does hair not grow?

Lips
Palms of hands
Soles of feet

How did you do?