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25g+30g+25g+26g+20g+24g =
100% = 150g
x% = 30g
150x=3000/ : 150
x = 20%
Tymianek stanowi 20% wysianych ziół.
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8,
a)2 z 10= 2/10 = 20%
b)0.5 z 4 = 5/40 = 12.5%
c)0.3 z 2.5 = 3/25= 12%
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9,
2kg + 5*0,2 g + 7 g = 2000 g + 1 g + 7 g = 2008 g.
sól : 1 g/2008 g = 1/2008
Zamieniamy na promile
1/2008 * 1000 promili = 0,49801 promili≈0,5 promila
cukier: 7 g/2008 g = 7/2008
Zamieniamy na promile
7/2008 * 1000 promili = 3,48606 promili≈ 3,5 promila
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10,
Na jedną partię zaprawy bierzemy 8 wiader substancji (1+1+6=8), a piasku jest 6 wiader. Zatem:
(6/8)*100%=75%
Piasek stanowi 75% zaprawy murarskiej
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