Question Paper from: SBI PO Mains 2017

If x number of yellow balls from bag B are taken and placed into bag A and 20% of black balls from bag A are taken and placed into in bag B. If we pick one ball from bag B then the probability that the ball is of black colour is 11/26. Then find the value of x?

Difference between the number of green balls in bag A and bag C is how much percent more/less than the sum of the number of black balls in bag A and bag C together?

Ram counted balls in Bag C and Bag A but mistakenly he counted green balls in bag B instead of C. What is error percentage (approx.)?