Question
18 years ago the average age of a family of four
members was 45 years. Two children were born in that span of 18 years. The present average age of the family remained unchanged. Among the two children who were born in between the 18 years, if the older child at present is 12 years more than the younger one, what is the respective ratio between the present age of the older child and the present age of the younger child?Solution
18 years ago, The sum of age of a family of four members = 45 × 4 = 180 years Now at present, The sum of age of four members = 180 + 18 × 4 =252 years Let the Present age of younger child be x years And the present age of older child = (x + 12) years Now, as per the question 252 + x + 12 + x = 45 × 6 2x = 270 – 264 2x = 6 x = 3 Hence the required ratio = (3+12) : 3 = 15: 3 = 5: 1
Which of the following is an example of a symbiotic bacterium commonly found in root nodules?
The scientific study of diseases in plants, identification of the pathogen and their management is known as
Among the options given below, which of the following fishes possess electric organ?
According to Basic Animal Husbandry Statistics 2023, total milk production in the country during 2022-23 is estimated to be _____
Upon arrival of the food consignment for import, the importer shall file:
Isolation distance for the production of foundation seed of Onion
Embryo of seeds, secrete_________ enzyme to induce the germination process
The angle between the observer’s meridian and declination circle of the heavenly body is called
Which additives are used for the purpose of restoring nutrients lost or degraded during production?
Which regions in India are specially considered for the Special Area Games Support Programme by the Sports Authority of India?