Question

if x/3=47,then x=?. ​

Answer 1

$\begin{gathered}\begin{gathered} \sf Length \: \: \: \: \: \: \: \: \: \: \: \\ \begin{gathered}\begin{gathered}\boxed{\begin{array}{}\bf {\green{}}\\{\qquad \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }{}\\ { \sf{ }}\\ { \sf{ }} \\ \\ { \sf{ }}\end{array}}\end{gathered}\end{gathered} \sf Breadth \end{gathered}\end{gathered}$

$\begin{gathered}\begin{gathered} \sf 120 \: m \: \: \: \: \: \: \: \: \: \: \: \\ \begin{gathered}\begin{gathered}\boxed{\begin{array}{}\bf {\red{}}\\{\qquad \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }{}\\ { \sf{ }}\\ { \sf{ }} \\ \\ { \sf{ }}\end{array}}\end{gathered}\end{gathered} \sf 35 \: m\end{gathered}\end{gathered}$

${\large{\pmb{\sf{\underline{\maltese \: \: Note :}}}}}$ Only for trying this rectangle

5pipes=

5

480

${\bf {\red {\therefore{5\: pipes =96 \: minutes }}}$

∴5pipes=96minutes

$\begin{gathered}\\ \\\end{gathered}$

Answer 2

Step-by-step explanation:

x⁴+1/x⁴=47

or, x⁴+1/x⁴+2-2=47

or,{(x²)²+2.x².1/x²+(1/x²)²}=47+2

or, ( x²+1/x²)²=49

or, (x²+1/x²)² =7²

or x²+1/x²=7 [neglecting the negative sign]

or, x²+1/x²+2-2=7

or, x²+2.x².1/x²+1/x²=7+2

or, (x+1/x)²=9

or, (x+1/x)²=3²

or, x+1/x=3 [neglecting the negative sign]

therefore, x³+1/x³

=(x+1/x³)-3.x.1/x(x+1/x)

=(3)³-3(3)

=27-9

=18 Ans