Given that Ammonium sulphate contains 20% nitrogen, it means that in one ton (1000 kg) of Ammonium sulphate, there are 200 kg of nitrogen (1000 kg * 20% = 200 kg). To calculate the cost per unit of nitrogen, we divide the total cost (Rs 640) by the quantity of nitrogen (200 kg): Cost per unit of nitrogen = Rs 640 / 200 kg = Rs 3.2/kg N Therefore, the correct answer is (b) Rs 3.2/kg N.
Rohan's present age is 3/7 times the age of his mother. After five years, he will be one- half of the age of his mother. How old is his mother at pres...
Six years ago, the age of 'R' compared to the age of 'M' six years from now was in the ratio 4:7. If the current average age of 'R' and 'M' is 33 years,...
The average of present ages of Rajesh and his father is 45 years. The age of Rajesh 5 years hence from now will be 1/4 of the pre...
The present ages of Vikas and Sneha are in the ratio 7:4, respectively. After 6 years from now, the sum of their ages will be 78 years. Find the present...
In a company, there are 15 employees. The average age of all the employees is 32 years.If the age of two directors and 1 supervisor is included, then th...
The average age of 12 boys in a group is 8 years. If 3 more boys join the group, the average is increased by 1 year. What is the average age (in year...
Nine years ago, the ratio of ages of Raj and Vijay was 5:7, respectively. Four years hence, the ratio of ages of Sanjay and Vijay will be 2:3, respectiv...
Laxman and his grandmother's current average age is 38 years. Four years from now, Laxman's age will be one-third of his grandmother's current age. Dete...
The present average age of ‘A’ and ‘B’ is 10 years, present average age of ‘A’ and ‘C’ is 6 years and present average age of ‘B’ and...
C is three years older than B, while ratio of age of A to that of B four years ago was 3: 5. If age of A eight years later will be equal to the age of C...
