Question
Determine the volume of a cube if the total cost to
paint its four walls is Rs. 1280, given that the painting rate is Rs. 5 per square meter.Solution
Let length of side of cubical box be 'x' m Area of four walls = 1280/5 = 256 m2 So, 4x2Â = 256 x2Â = 64 x = 8 cm Desired volume = 8 X 8 X 8 = 512 m3 Hence, option d.
A boy’s age is 130% of what it was 10 years ago, but 65% of what it will be after 10 years. What is his present age?
Present ages of 'A' and 'B' are in the ratio 3:5, respectively. If B's age, 8 years hence from now will be 3 times of A's age, 2 years ago from now, the...
The average age of three children in a family is 25% of the average of the age of father and the eldest child. The total age of the mother and the young...
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Sum of the present ages of A, B, C and D is 40 years. After 3 years ratio of their ages is 5:3:2:3. What is C’s present age?
A boy’s age is 140% of what it was 5 years ago, but 65% of what it will be after 10 years. What is his present age?
8 years ago, the average age of a family of six persons was 50 years. In between these 8 years the family adopted a girl. Now at present the average age...
The present ages of A and B are in the ratio 7:9. After 8 years, their ages will be in the ratio 9:11. What is A's present age?
The current age ratio of P to Q is 9:13. Six years ago, Q's age was 4 years less than twice P's age at that time. If the average ...
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