____ are the most efficient of all sources and most recommended for houseplants.
Fluorescent lights are efficient and often recommended for houseplant growth due to their appropriate wavelength spectrum and energy efficiency.
In a classroom there are 13 boys and 11 girls. Average age of each boy and each girl is 23 years and 17 years respectively. The sum of ages of all the b...
There are 6 children in a family. The average age of the children is 14 years. If the present age of their mother and father is added, the average age o...
4 years ago, the average age of a family of six persons was 30 years. In between these 4 years the family adopted a girl. Now at present the average age...
The ratio of A and B present age is 7:3. The product of their ages is 8400. What will be the ratio of their ages after 4 years?
A and B are two friends. 9 years hence, age of A will become 2.5 times the present age of B, and the age of B will become 30% less than the 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...
Mahesh said to his son, “At the time of your birth” I was as old as you are at present. If the Mahesh’s age is 42 years now then what will be the ...
A is 3 years older than B while C is 4 years younger than B. The ratio of age of A, 8 years hence and age of B, 6 years ago is 5:4. What was age of C, 1...
The present age of A is 5/2 times to that of his marriage age. Present age of his brother is 1/5th of his present age. If A was married 36 years ago the...
The average age of 66(2/3)% of the number of children in a group is 13 years. The average age of all the children in the group is 14.5 years. What is t...
