For the following questions answer them individually
In a computer game, a builder can build a wall in ten hours while a destroyer can demolish such a wall completely in fourteen hours. Both, the builder and the destroyer were initially set to work together on level ground. But after 7 hours the destroyer was taken out. What was the total time (in hours) taken to build the wall?
Choose the correct mirror image of the problem figure if the mirror if placed to the right of the figure.
Consider the given question and decide which of the following statements is sufficient to answer the question.
Who among P, Q, R, S and T is lightest in weight?
Statements:
1. Q weight < P and S also S weight > T
2. R weight > Q but < T
$$\frac{2}{3}$$ of a milk-water mixture was milk. There was 21 litres of the mixture. If 4 litres of water is added to it, the percentage of milk in the new mixture will be: