Question

calcule :

a) 17% de 1050L

b) 35% de 800ml

c) 75% de 1000 KL

d) 60% de 525 cm

Answer 1

$a) \\ \\ \dfrac{1050}{100} = \dfrac{x}{17} \\ \\ \\ 100x = 1050 * 17 \\ \\ \\ 100x = 17850 \\ \\ x = \dfrac{17850}{100} \\ \\ \\ x = 178,5 \ L$

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$b) \\ \\ \dfrac{800}{100} = \dfrac{x}{35} \\ \\ \\ 100x = 800 * 35 \\ \\ \\ 100x = 28000 \\ \\ x = \dfrac{28000 }{100} \\ \\ \\ x = 280\ ml$

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$c) \\ \\ \dfrac{1000}{100} = \dfrac{x}{75} \\ \\ \\ 100x = 1000 * 75 \\ \\ \\ 100x = 75000 \\ \\ x = \dfrac{75000 }{100} \\ \\ \\ x = 750\ kl$

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$db) \\ \\ \dfrac{525}{100} = \dfrac{x}{60} \\ \\ \\ 100x =525 * 60 \\ \\ \\ 100x = 31500\\ \\ x = \dfrac{31500}{100} \\ \\ \\ x = 315\ cm$

Answer 2

A) 17% de 1050 L = 178.5 L

Primeiro multiplica: 1050 x 17 = 17850
E divide: 17850 /100 = 178.5

B) 35%  de 800 ml = 280 ml

Multiplica: 800 x 35 = 2800
Divide: 2800 /100 = 280

C) 75% de 1000 KL = 750 KL

Multiplica: 1000 x 75 = 75000
Divide: 75000 /100 = 750

D) 60% de 525 cm = 315 cm

Multiplica: 525 x 60 = 31500
Divide: 31500 /100 = 315

(Toda porcentagem tem que ser dividida por cem)