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1. 4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat-weavers in 8 days?

A. 4

B. 8

C. 12

D. 16

Solution:

Let the required number of bottles be x.
More weavers, More mats (Direct Proportion)
More days, More mats (Direct Proportion)

\begin{matrix} Wavers 4 : 8 \\ Days 4 : 8 \end{matrix}} :: 4 : x

\begin{aligned} ∴ 4 \times 4 \times x = 8 \times 8 \times 4 \\ \Rightarrow x = \frac{8 \times 8 \times 4}{4 \times 4} \\ \Rightarrow x = 16 \end{aligned}

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