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sasho [114]
2 years ago
5

God, somebody help me!!!

Mathematics
1 answer:
cestrela7 [59]2 years ago
5 0

Answer:

Step-by-step explanation:

When solving proportions like these, you can set them up using fractions

#1:

\frac{3}{9} = \frac{2}{x}\\\frac{1}{3} = \frac{2}{x}\\cross \: multiply\\x = 6\\3:9 = 2:6

#2:

\frac{57}{x} = \frac{19}{38}\\\frac{57}{x} = \frac{1}{2}   \\x = 114\\57 : 114 = 19 : 38

#3:

\frac{7}{x} = \frac{2}{3}  \\21 = 2x\\x = \frac{21}{2} = 10.5\\7:10.5 = 2:3

#4

\frac{15}{2} = \frac{x}{8}\\x = \frac{15*8}{2} = 60\\15:2 = 60:8

#5

\frac{0.3}{4} = \frac{9}{x}\\0.3x = 36\\x = \frac{36}{0.3} = 120  \\0.3:4 = 9:120

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