Dreamtech Expert Team Solutions for Chapter: Practice Test, Exercise 2: Quantitative Aptitude

Alloy $1$ contains copper and tin in ratio $1: 2$, and alloy $2$ contains copper and tin in ratio $2 : 3$. These alloys are mixed in a certain ratio to form alloy $3$ with ratio $4 : 7$. In what ratios are alloy $1$ and alloy $2$ mixed?

Values of $1$ rupee , $50$ paise and $25$ paise coins in a bag are in the ratio of $13 : 11 : 7$. The total number of coins is $378$. Find the number of $50$ paise coins.

The mixture of milk and water consists of $40\%$ water. The addition of $45$ litres of milk makes the percentage of milk $78\%$ in the mixture. Find the original quantity of the mixture.

The interior and exterior angles of a regular polygon are in the ratio $2:1$. How many sides does that polygon have?

Deepa invested an amount of $Rs. 9,450$ at the rate of $5\%$ per annum for $3$ years. What approximate amount of compound interest will she obtain at the end of $3$ years?

Two pipes can fill a tank in $10 \mathrm{h}$ and $16 \mathrm{h}$ respectively. A third pipe can empty the tank in $32 \mathrm{h}$. If all the three pipes function simultaneously, then in how much time will the tank get filled?

The lengths of two trains are $154 m$ and $246 m$ respectively and they are running towards each other. The speeds of these trains are $52 km/h$ and $28 km/h$, respectively. How much time will they take to cross each other?

Pipe A can fill a tank in $5 \mathrm{hr}$, pipe B can fill it in $8 \mathrm{hr}$, while a leak in C can empty it in $12 \mathrm{hr}$. Assume that the tank is empty and the pipes and the leak are opened together. However, pipe A is closed after $3 \mathrm{hr}$. In how many hours will the tank get filled?