Prakash Tiwari and Ishita Joshi Solutions for Chapter: Comparing Quantities, Exercise 8: Brain Teaser

If thrice of $A$ is five and two-ninths of $B$ is $12$ and seven-tenths of $A$ is half of $C$. The ratio of $A:(C-1)$.

The perimeter of a triangle is $45 \mathrm{cm}$. If the ratio of the smallest and the largest side is $3:7$ and the leftover side is one-third of the perimeter, then find the difference between the largest and smallest side.

$x:y=2:3$, then find the values of $(5x+4y):(5y-4x)$

A truck usually covers $240 \mathrm{km}$ in $4 \mathrm{hrs}$, but due to overload, the speed comes down by $45 \mathrm{km}/\mathrm{hr}$. Find what percentage of the old speed is the new speed 

If $24$ men need $72 \mathrm{kg}$ of rice per month $(30 \mathrm{days})$, then find the quantity of rice needed by $15$ men for $10 \mathrm{days}$.