Question

If a:b=7:3 and a+b=20,then be = ______, explain your answer step by step.​

Answer 1

let the ratio be x

therefore, 7x+3x = 20

or, 10x = 20

or, x = 20/10

or, X =2

therefore, 7x = 7×2 = 14

3x = 3×2 = 6

Answer 2

Answer:

$\huge\underline{ \underline{ \red{your \: \: answer}}}$

Step-by-step explanation:

$\sf\green{ \frac{a}{b} = \frac{7}{3} \: an \: a + b = 20} \\ \sf\green{ = > a = \frac{7b}{3} } \\ \sf\purple{value \: of \: a \: put \: in \: a+b } = 20\\ \sf\green{ = > \frac{7b}{3} + b = 20} \\ \sf\green{ = > \frac{7b+ 3b}{3} = 20 } \\ \sf\green{ = > 10b = 60} \\ \sf\green{ = > b = \frac{60}{10} } \\ \sf\green{ = > b = 6} \\ \large\boxed{ \fcolorbox{red}{orange}{hope \: it \: help \: you}}$