Question

29) Calcule :
a) 20% de 300
b) 15% de 160
c) 9% de 50
d) 35% de 40
e) 40% de 230
f) 50% de 1000
g) 70% de 450
h) 90% de 340
i) 100% de 200
j) 25% de 50
k) 30% de 250​

Answer 1

Resposta:

a) 20% de 300 = 60

b) 15% de 160 = 24

c) 9% de 50 = 4,5

d) 35% de 40 = 14

e) 40% de 230 = 92

f) 50% de 1000 = 500

g) 70% de 450 = 315

h) 90% de 340 = 306

i) 100% de 200 = 200

j) 25% de 50 = 12,5

k) 30% de 250​ = 75

Explicação passo-a-passo:

• a) 20% de 300

$\frac{300}{x} = \frac{100}{20}$

$100 . x = 300 . 20$

$100x = 6000$

$x = 6000 : 100$

$x = 60$

• b) 15% de 160

$\frac{160}{x} = \frac{100}{15}$

$100.x = 160.15$

$100 x = 2400$

$x = 2400 : 100$

$x = 24$

• c) 9% de 50

$\frac{50}{x} = \frac{100}{9}$

$100.x = 50 . 9$

$100x = 450$

$x = 450 : 100$

$x = 4,5$

• d) 35% de 40

$\frac{40}{x} = \frac{100}{35}$

$100.x = 40 .35$

$100x = 1400$

$x= 1400 : 100$

$x = 14$

• e) 40% de 230

$\frac{230}{x} = \frac{100}{40}$

$100.x = 230.40$

$100x = 9200$

$x= 9200 : 100$

$x = 92$

• f) 50% de 1000

$\frac{1000}{x} = \frac{100}{50}$

$100.x = 1000.50$

$100x = 50000$

$x = 50000 : 100$

$x = 500$

• g) 70% de 450

$\frac{450}{x} = \frac{100}{70}$

$100.x = 450.70$

$100 x = 31500$

$x = 31500 : 100$

$x = 315$

• h) 90% de 340

$\frac{340}{x} = \frac{100}{90}$

$100.x = 340.90$

$100x = 30600$

$x = 30600 : 100$

$x = 306$

• i) 100% de 200

$\frac{200}{x} = \frac{100}{100}$

$100.x = 200.100$

$100x = 20000$

$x = 20000: 100$

$x = 200$

• j) 25% de 50

$\frac{50}{x} = \frac{100}{25}$

$100.x = 50.25$

$100x = 1250$

$x= 1250 : 100$

$x = 12,5$

• k) 30% de 250​

$\frac{250}{x} = \frac{100}{30}$

$100 . x = 250 . 30$

$100x = 7500$

$x = 7500 : 100$

$x = 75$

Observação :

Espero ter ajudado, bons estudos :)

                                                                       Att: EduardaMuhlbeier