Question

Simple equations
7th class ​

Answer 1

Answer:

10)

$\frac{3n}{11}=\frac{3}{55} \\165n = 33\\n = 5$

11)

$\frac{9r}{98} = \frac{9}{49} \\441r = 882\\r = 2$

12)

$x+2 = 5\frac{4}{9}\\x+2=\frac{49}{9} \\x=\frac{31}{9}$