The growth rate is almost same in boys and girls is at the age of

18 years is the minimum age of marriage for girls

D) First Axiom

Total weight of girls and boys = Mean x no. of students  = 23 x 50 = 1150 Weight of boys = Mean of boys x no. of boys  = 30 x 20...

Correct option is  B) 15 years

Correct option is (D) none Let Ramu's present age be x years. \(\therefore\) Ramu's age before 4 years = (x - 4) years Ramu's age after 12 years = (x + 12) years \(\therefore\) x+12 = 3(x-4) \(\Rightarrow\) x+12...

The growth in height nearly stopped in boys is at the age of 17 years

A) The secretions of sebaceous glands are very active at this stage

Let the present age of Shikha be ‘a’ years.  Given, product of Shikha’s age five years ago and her age 8 years later is 30  ⇒ (a – 5)(a + 8) =...