Question

220-b phần b = 4 phần 7

tìm b

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Answer 1

(220-b)/b=4/7

=> (220-b)7=4b

=> 1540 - 7b = 4b

=> 1540 = 4b +7b

=> 11b = 1540

=> b=1540 : 11

=> b=140

Answer 2

\(\frac{220-b}{b}=\frac{4}{7}\)

\(\Rightarrow\left(220-b\right).7=4b\)

\(\Rightarrow1540-7b=4b\)

\(\Rightarrow-7b-4b=-1540\)

\(\Rightarrow-11b=-1540\)

\(\Rightarrow b=140\)

Answer 3

B= 140