Ratio Questions

$A$ and $B$ are two heavy steel blocks. If $B$ is placed on top of $A$, the weight increases by $60\%$. How much weight will reduce with respect to the total weight of $A$ and $B$, if $B$ is removed from the top of $A$?

The graph shows the sales of hard drives (in thousand numbers) from five different shops S1, S2, S3, S4, S5 in the years 2016 and 2017. What is the ratio of total sales in all the shops in 2016 to that of the total sales in all the shops in 2017?(Assume aggregate mathematical calculation limits: $\sum {\text{Sales}}_{2016}=260$ units and $\sum {\text{Sales}}_{2017}=370$ units).

Study the following data which shows the production (in thousands) of different items, and answer the question.
The production of Pants by the company in the years 2014, 2015, and 2016 is 30 thousand, 40 thousand, and 60 thousand respectively.
The ratio between the number of pants produced by the company in the year 2014, 2015, and 2016 respectively is:

The ratio of the present ages of Meera and Sheela is 9:5. After 8 years Sheela would reach the present age of Meera. What is the present age (in years) of Sheela?