Book Maths Puzzle Numerical Ability Time and Work

0.8 portion of a tank is filled with water. If 25 litres of water is taken out from the tank, 14 litres of excess water over the half filled up tank remains in it. Find the capacity of the tank.

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Book Other Question

The ratio of ages of two persons is 4 : 7 and one is 30 years older than the other. Find the sum of their ages.
When we perform a ‘digit slide’ on a number we move its unit digit’s to the front of the number. For example, the result of a ‘digit slide’ on 6471 is 1647. Let ‘z’ be the smallest positive integer with 5 as its unit’s digit such that the result of a ‘digit slide’ on number equals 4 times the number. How many digits will ‘z’ have?
a. 7
b. 6
c. 4
d. 3