BrainBashers - Random Puzzles

Puzzle 317

If 7 ingots of IRON weigh 112 tonnes, 4 ingots of COBALT weigh 104 tonnes and 3 ingots of GOLD weigh 54 tonnes.

How heavy are 5 ingots of TIN?

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Puzzle 318

What four related items have been mixed together:
K N A N O T E E X H I W S Y O R A S K O A S

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Puzzle 319

This is a well known children's musical piece, the vowels have been removed and the remaining letters have been grouped together. Can you determine the correct words?
lttl mssm ffts tntf fttn ghrc rdsn dwhy thrc mbgs pdrw hstd wnbs dhrn dfrg htnd mssm fftw y

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Puzzle 320

Can you find the country hidden in the following paragraph:

At school, most of my friends learnt French. I learnt Chinese, mainly because I planned to visit the area when I grew up.

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