Question

cong ca tu va mau cua phan so \(\frac{23}{40}\)voi cung mot so tu nhie­n N roi rut gon ta duoc phan so \(\frac{3}{4}\)

Answer 1

Theo bài ra ta có : \(\frac{23+n}{40+n}=\frac{3}{4}\)

\(\Rightarrow4.\left(23+n\right)=3.\left(40+n\right)\)

\(\Rightarrow92+4n=120+3n\)

\(\Rightarrow4n-3n=120-92\)

\(\Rightarrow n=28\)

Vậy số n cần tìm là 28

Answer 2

=>( 23+a)/(40+a)=3/4

=>4*(23+a)=3*(40+a)

=> 92+4a=120+3a

=> a=28

=.số N đó là 28

Answer 3

\(\frac{23+n}{40+n}=\frac{3}{4}\)

\(=>4.\left(23+n\right)=3.\left(40+n\right)\)

\(=>92n+4n=120+3n=4n-3n=120-92=n=28\)

~Study well~ :)

Answer 4

Ta có : \(\frac{23+n}{40+n}=\frac{3}{4}\)

\(\Leftrightarrow4\left(23+n\right)=3\left(40+n\right)\)
\(\Leftrightarrow92+4n=120+3n\)

\(\Leftrightarrow4n-3n=120-92\)

\(\Leftrightarrow n=28\)