According to most body-mass-indexes, your weight and height are almost on par with ideal. So definitely not "too" skinny, but there are various things to keep in mind when calculating your own, personal, healthy bmi:
Your age, gender, genetics, health issues, etc.
If you are exercising regularly, eating a balanced diet (including a multivitamin), and most importantly have a positive outlook about yourself, you have nothing to worry about.
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56 kilograms, 128 pounds, 60 kilograms, 137 pounds.
According to the current exchange (10 Dec. 2014) 56 Euros are worth 44,17 pounds.
divide by 16
As shown by the convention, 56 pennies are 0.56 dollars or 0.56 pounds.
10% of 280 pounds would be 28.0 pounds. So 28.0 + 28.0 = 56.0 pounds. 20% of 280 pounds is 56 pounds.