Question

Oblicz, jaki procent liczby b stanowi liczba a. a) a=15,b=20
b) a=48, b=64
c) a=40, b=64
d) a=980, b=1000
e) a=240, b=80
f) a=2, b=1900
g) a=380, b=200
h) a=125. b=890
i) a=100, b=78

Answer 1

A) a=15,b=20 15/20=0,75=75% b) a=48, b=64 48/64=0,75=75% c) a=40, b=64 40/64=0,625=62,5% d) a=980, b=1000 980/1000=0,98=98% e) a=240, b=80 80/240=33 i 1/3% f) a=2, b=1900 2/1900=2/19% g) a=380, b=200 200/380=5 i 5/19% h) a=125. b=890 125/890=14 i 4/89% i) a=100, b=78 78/100=0,78=78%

Answer 2

a)      a=15,b=20

15    – x

20    – 100

20x = 1500 /:20

a = 75%

 

b) a=48, b=64

48 – x

64 – 100

64x = 4800 /:64

x = 75%

c) a=40, b=64

40 – x

64 – 100

64x = 4000 /:64

x = 62,5%

d) a=980, b=1000

980 – x

1000 – 100

1000x = 98000 /:1000

x = 98%

e) a=240, b=80

240 – x

80 – 100

80x = 24000 /:80

x = 300%

f) a=2, b=1900

2 – x

1900 – 100

1900x = 200 /:1900

x = około 0,11%

g) a=380, b=200

380 – x

200 – 100

200x = 38000/:200

x = 190%

h) a=125. b=890

125 – x

890 – 100

890x = 12500 /:890

x = około 14,04%

i) a=100, b=78

100 – x

78 – 100

78x = 10000/:78

x = około 128,26%