For the following questions answer them individually
The Bar graph shown below presents the number of employees in an office during eight consecutive years.
The number of employees in year Y2 is how much percent less than average number of employees per year?
What is the value of $$\left(1 + \frac{3}{4}\right) \times \frac{3}{21} of 5\frac{1}{3} \div \frac{128}{49} + \frac{2}{3} \times \frac{7}{11} \times \frac{121}{49} \div \left(\frac{15}{14} - \frac{2}{7}\right)$$?
The average age of a group of 20 men is 30 years. A 50 year old man leaves the group, while a woman joins the group. The average age decreases by 1 year. What is the age of the woman ?
A train moves at the speed of 80 km/h and crosses a platform in 0.75 minutes. If the length of the train is equal to the length of the platform, then what is the length of the platform?
If $$A = 2 \div 3 \times 4, B = 3 of 4 + (7 - 2)$$ and $$C = 4 + 5 - 6$$, then what is the value of $$A + B + C$$?