Question

please answrr which is not done

Answer 1

$\underline{\bold{Question:5}}$

What per cent of 650 is 130 ?

$\underline{\bold{Solution:}}$

Let x % of 650 is 130.

$\implies{\bold{650\times\frac{x}{100}=130}}\\\\\\\implies{\bold{x=130\times\frac{100}{650}=20\%.}}\\\\\\\boxed{\bold{Per\:cent=20\%.}}$

$\underline{\bold{Question:6}}$

Find out 15% of 3.5 km.

$\underline{\bold{Solution:}}$

$\bold{=\frac{15}{100}\times3.5}\\\\\\\bold{=0.525\:km}\\\\\\\bold{\boxed{\bold{0.525\:km.}}}$

$\underline{\bold{Question:7}}$

12.5% of a number a number is 75 . Find the number.

$\underline{\bold{Solution:}}$

$\bold{Let\:the\:no.\:be\:x.}$

$\implies{\bold{x\times\frac{12.5}{100}=75}}\\\\\\\implies{\bold{x\times\frac{1}{8}=75}}\\\\\\\implies{\bold{x=75\times8=600.}}\\\\\\\bold{\boxed{\bold{Number=600.}}}$

$\underline{\bold{Question:8}}$

If CP is Rs. 750 and profit is Rs. 150 , then find the profit per cent.

$\underline{\bold{Solution:}}$

$\bold{Profit\%=\frac{profit\times100}{CP}}$

$\bold{=\frac{150\times100}{750}}\\\\\\\bold{=20\%}\\\\\boxed{\bold{Profit\%=20\%}}$

$\underline{\bold{Question:9}}$

Find the value of x , if 15 : x = 3 : 5.

$\underline{\bold{Solution:}}$

$\implies\bold{\frac{15}{x}=\frac{3}{5}}\\\\\\\implies\bold{3 x = 75}\\\\\implies\bold{x = \frac{75}{3}=25.}\\\boxed{\bold{x = 25}}$

$\underline{\bold{Question:10}}$

Find SI , if principle = Rs. 2000 , rate = 15% per annum and time = 4 years.

$\underline{\bold{Solution:}}$

$\bold{SI=\frac{Principle*rate*time}{100}}$

$\bold{=\frac{2000*15*4}{100}=1200.}$

$\boxed{\bold{SI=Rs.1200.}}$

$\underline{\bold{Question:11}}$

Find the marks in % . If Ravi gets 320 marks out of 500.

$\underline{\bold{Solution:}}$

$\bold{Percentage=\frac{320*100}{500}=64\%.}\\\\\boxed{\bold{Marks\:\%=64\%.}}$

$\underline{\bold{Question:12}}$

Express 250% as a ratio in the lowest form.

$\underline{\bold{Solution:}}$

$\bold{=\frac{250}{100}=\frac{5}{2}.}\\\\\\\boxed{\bold{Lowest\:ratio =5:2.}}$

Answer 2

$\mathfrak{\huge{Answer:}}$

$\bold{5.\:What\:per\:cent\:of\:650\:is\:130?}$
$\sf{Solution:}$ Let the per cent be = x

Then : $\sf{x}$% $\sf{\: of \: 650 = 130}$

=》 $\sf{x = \frac{130\times100}{650}}$

=》 $\tt{x = 20}$%

$\bold{6.\:Find\:out\:15\:percent\:of\:3.5\:km}$
$\sf{Solution:}$ $\sf{\frac{15}{100}\times 3.5}$

=》 $\tt{0.525\:km}$

$\bold{7.\:12.5\:percent \:of\:a\:number\:is\:75. Find\:the\:number.}$
$\sf{Solution:}$ Let the number be = x

Then : $\sf{12.5}$% $\sf{of \:x = 75}$

=》 $\sf{x = \frac{75\times 100}{12.5}}$

=》 $\tt{x = 600}$

$\bold{8. If\:CP=Rs.750,\:Profit=Rs.150, \:find\:Profit}$%
$\sf{Solution:}$ Profit % = $\sf{\frac{Profit}{CP}\times100}$

=》 Profit% = $\sf{\frac{150}{750}\times100}$

=》 Profit% = $\tt{20}$%

$\bold{9.\:Find\:the\:value\:of\:x\:if\:15:x=3:5}$
$\sf{Solution:}$ $\sf{\frac{15}{x} = \frac{3}{5}}$

=》 $\sf{75 = 3x}$

=》 $\tt{x = 25}$

$\bold{10.\:Find\:SI\:if\:Principal = Rs.2000,}$
$\bold{Rate= 15\:percent\:per\:annum\:and\:time = 4 yrs}$
$\sf{Solution:}$ SI = $\sf{\frac{PRT}{100}}$

=》 $\sf{SI = \frac{2000\times 15\times 4}{100}}$

=》 $\tt{SI = Rs. 1200}$

$\bold{11.\:Find\:marks\:percent\:if\:Ravi\:gets\:320\:out\:of\:500}$
$\sf{Solution:}$ % = $\sf{\frac{320}{500}\times100}$

=》 $\tt{64}$%

$\bold{12.\:Express\:250\:percent\:as\:a\:ratio}$
$\sf{Solution:}$ Ratio = $\sf{\frac{250}{100}}$

=》 $\tt{Ratio = 5:2}$