Question

answer all please --​

Answer 1

$\large\mathscr \color{black}\colorbox{red}{\colorbox{orange}{\colorbox{yellow}{\colorbox{green}{\colorbox{blue}{\colorbox{indigo}{\colorbox{violet}{\underline {ANSWER}}}}}}}}$

4.

(vii)

$\large\mathfrak\color{magenta}{Let\:the \:required \:value\: be\: x}$

$\tt\color{lime}{\frac{25}{100}\times \: x =200 } \\\tt\color{lime} {\implies x = 200 \times \frac{100}{25}} \\\tt\color{lime} {\implies x =\underline{\underline{{800}}}}$

(viii)

${\tt\color{lightblue}{Perimeter\:of\:Triangle}}\\={\tt\color{lightblue}{2(l+b)}}\\\large\tt\color{lightblue}{\implies P=2(8+6)= \underline{\underline{{28m}}}}$

(ix)

$\tt\color{yellow}{{(\frac{2}{5})}^{3}={(\frac{2}{5})}^{2y-1}}\\\tt\color{yellow}{\implies 3=2y-1}\\\tt\color{yellow}{\implies 2y=4}\\\tt\color{yellow}{\implies y=2}$

(x)

$\tt\color{orange}{As\:the\:selling\:price\:is\:less}\\\tt\color{orange}{than\:the\:cost\:price,Loss\: takes\:place\:here}$

$\tt\color{orange}{LOSS=CP-SP=350}$

$\tt\color{orange}{Loss\%=\frac{CP-SP}{CP}\times100}$

$\large\tt\color{orange}{Loss\%=\frac{350}{1700}\times100=\frac{35}{17}=\underline{\underline{2.5\%}}}$

5

(i)

$20\% \: of \: x = \frac{20}{100} x = 0.2x \\ \\\implies 0.2x + x = 100 \\\implies 1.2x = 100 \\\implies x = \frac{100}{1.2} =\underline{\underline{{83.3}}}$

(ii)

$\tt{Let\:the\:number\:be\:x}\\\large\tt{7+3x=28}\\\large\tt{3x=21}\\\large\tt{x=\frac{21}{7}}=\huge\tt{\underline{\underline{3}}}$