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Quiz básico de proporções diretas

Created by

Evelin Marchetti
Evelin Marchetti
Brazil

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Quiz básico de proporções diretas

by Evelin Marchetti
1

5 kg de tomate custam 15 reais. Quanto custará 8 kg?

2

Se 3 repolhos custam 9 reais, quanto sai 7 repolhos?

3

Uma lâmpada dura 40 horas com 4W. Quantas horas dura com 6W?

4

Se 12 salgados ficam prontos em 18 minutos, quantos minutos levam 6 salgados?

5

Uma máquina produz 120 peças em 8 horas. Quantas horas para 300 peças?

6

Se 2 litros de tinta rendem 16 m², quanto rendem 5 litros?

7

Um carro percorre 150 km com 10 litros. Quantos litros são necessários para 300 km?

8

Se 9 livros pesam 2,7 kg, quanto pesam 20 livros?

9

Uma receita pede 4 colheres de açúcar para 2 xícaras de farinha. Quantas xícaras para 3 colheres?

10

Se 5 itens custam 25 reais, quanto custam 9 itens?

Explicação

Proporção direta: 5/15 = 8/x → x = 15*8/5 = 24 reais.

3/9 = 7/x → x = 9*7/3 = 21 reais.

Regra de três inversa? Na verdade direto: consumo maior reduz duração. 4/40 = 6/x → x ≈ 26,7 h.

Proporção direta: 12/18 = 6/x → x = 18*6/12 = 9 min.

Proporção direta: 120/8 = 300/x → x = 8*300/120 = 20 h.

Proporção direta: 2/15 = 5/x → x = 15*5/2 = 37,5 m².

Consumo direto: 150/10 = 300/x → x = 10*300/150 = 20 L.

Regra de três direta: 9/2,7 = 25/x → x ≈ 7,5 kg.

Proporção direta: 4/2 = 3/x → x = 2*3/4 = 1,5 xícaras.

Regra de três direta: 5/25 = 9/x → x = 25*9/5 = 45 reais.

 
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