Question
The average of four numbers is 90. Two of the numbers
are equal (not least), and 40 more than the least number. If the 4th number is five times the least number then find the average of smallest and largest number.Solution
ATQ, Let the two equal numbers be ‘e’ each Therefore, least number = (e – 40) 4th number = 5(e – 40) According to the question, 5(e – 40) + e – 40 + e + e = 4 × 90 Or, 8e – 240 = 360 Or, e = 600/8 = 75 Therefore, 4 numbers are 75, 75, 35, and 175 Therefore, required average = (175 + 35)/2 = 105
Chemical equation is balanced according to the law of
A man cannot see clearly beyond 10 meters. The disease he suffers from :
Consider the reaction-
Copper sulphate solution (blue) + Iron → Iron sulphate soluton + Copper What is the colour of the iron sulphate solution?
The Weight of an object on Earth is 600 N. What will be its weight on moon?
Heat from the sun reaches earth by the process of –
Which part of the human brain controls voluntary actions?
A bottle of sodalime is grasped by the neck and swung briskly in a vertical circle, Near which portion of the bottle do the bubbles collect?
The substance which conducts current in the solid state is –
A positively charged particle enters a uniform electric field directed downward. The force acting on the particle is:
Which of the following gases is also known as a 'Stranger' gas?
Relevant for Exams:
