Question
The average age of a husband and his wife was 23 years
when they were married 5 years ago. The average age of the husband, the wife and their child is 20 years now. How old is the child now?Solution
Let present ages of husband, wife and child be x, y and z years respectively. Given, ⇒ [(x – 5) + (y – 5)]/ 2 = 23 ⇒ x + y = 46 + 10 = 56 Given, ⇒ (x + y + z)/3 = 20 ⇒ x + y + z = 60 ⇒ 56 + z = 60 ⇒ z = 4 ∴ Child is 4 years old now.
In the vulcanization process, natural rubber is heated with which element to enhance its properties?
Which of the following is considered an antiknock compound?
Which element commonly found in water is linked to cancer risks?
What is the atomicity of Helium?
Which of the following is the richest source of phosphorus?
Petroleum is a mixture of-
Analyze these statements about a buffer solution:
(I) A buffer solution stabilizes pH levels when small amounts of acids or bases are introduced....
Which statement about carbon credits is incorrect?
Which of the following is an ore of calcium?
Carbohydrates are organic compounds composed of which elements?
Relevant for Exams:
