$$25\% \ of (50\% \ of \ 30\% \ of \ 150)\over 40\% of \ 2250$$ is equal to:

Simplify  $$ ^{3}\sqrt{-2197} × ^{3}\sqrt{{-125}} \ ÷ ^{3}\sqrt{27\over512}$$.

Find the conjugate of (1 + i) ³ 

Given that ( 1² +2²+3²+………..+10²)=385, the value of (2²+4²+6²+……20²) is equal to

If $${b\over a}=0.7$$ find the value of $${a-b\over a+b}={11\over34}.$$

Find the value of $$ (2 {1\over6}+1 {13\over18}-{1\over6}) × {16÷4}$$

If $$ {y={2x-1\over x+3}}$$ find x when y=1

Solve: 12–[26–{2+5×(6–3)}]