Question

Plz tell answer of question 24,26,27

Answer 1

Q no. 26
a^2+4b^2+(c^2/9)+4ab-(4bc/3)-(2ac/3)

(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ac

Now,if we compare it,
then,

It can be written as,
(a+2b-(c/3))^2

Q no. 27
(64m^2+144mn+81n^2)-25p^2
It can be written as,
(8m-9n)^2-(5p)^2

8m-9n=a,
5p=b,

a^2-b^2=(a-b)(a+b)

So,
(8m-9n-5p)(8m-9n+5p)

Q no. 24
CP=300000Rs
1/3 of CP=100000Rs
loss %=loss/CP*100
20=loss/100000*100
loss=20000Rs
SP=80000Rs
2/5 part of CP=2/5*(300000-100000)
CP=80000Rs
gain%=gain/CP*100
25=gain/80000*100
gain=20000Rs
SP=100000Rs

The price of the left land=120000Rs
gain%=gain/CP*100
10=gain/120000*100
gain=12000Rs
SP=CP+Gain
SP=132000Rs

Hope,this helps you.