Question

state true or false A. 250 g : 1 kg = 12.80 m : 320 cm B. 18:24 = 9:12 C. 16 is to 28 as 42 is to 24 D. 2,4,15,30 form a proportion ( show the process) ​

Answer 1

$\: \: A. \: false\\ B .\: true\\ \: \: C. \: false\\ D.\: ture$

Step-by-step explanation:

$A. \: \: \frac{250g}{1kg} = \frac{250g}{1 \times1000g} = \frac{1}{4} \: \: and \\ \frac{12.80m}{320cm} = \frac{12.80 \times100cm }{320cm} = \frac{4}{1} \\ Then,\: \: \: \: 250 g : 1 kg ≠ 12.80 m : 320 cm\\ B . \: \: \frac{18}{24} = \frac{3}{4} \: \: and \: \: \frac{9}{12} = \frac{3}{4} \\ Then, \: \: \: \: 18:24 = 9:12 \\ C. \: \: \frac{16}{28} = \frac{4}{7} \: \: and \: \: \frac{42}{24} = \frac{7}{4} \\Then, \: \: 16 \: is \: to \: 28 ≠ 42 \: is \: to \: 24 \\ D. \: \: \frac{2}{4} = \frac{1}{2} \: \: and \: \: \frac{15}{30} = \frac{1}{2} \\Then, \: \: 2,4,15,30 \: are \: proportion$