self Maths Puzzle

A 12 lt solution is 33 1/3% acid. How much water must be added to get the solution having 20 % acid.

Read Solution (Total 1)

self Other Question

A train which travels at a uniform speed due to some mechanical fault after traveling for an hour goes at 3/5th of the original speed and reaches the destination 2 hrs late.If the fault had occurred after traveling another 50 miles the train would have reached 40 min earlier. What is distance between the two stations.

1. 300
2. 310
3. 320
4. 305

Ans: 1.
4+7=1281
4+6=1240
8+3=1241
9+9=?