Question
The ages of 4 members of a family are in the year 2011
are βXβ,βX+6β,βX+12β and βX+18β. After some years Oldest among them was dead then average reduced by 2. After how many years from his death, the average age will same as in 2011?Solution
Average of all in 2011 = {X + (X+6) + (X+12) + (X+18)}/4 = (4X + 36)/4 = X + 9 Let the oldest die after N years, then average of three persons, {X + (X+6) + (X+12) + 3N}/3 = (X+9-2) (3X+18+3N)/3 = X+7 X+6+N = X+7 N = 1 years Let after another M years, their average will be equal to that in 2011. So, (3X+18+3N+3M)/3 = X+9 (3X + 18 + 3x1 + 3M)/3 = X+9 X + 6 +1 +M = X+9 M = 2 years
Choose the combination that completes the sentence.
You are required to match statements from columns 1 and 2 and find which of the following pairs of statement make sense meaningfully and grammatically....
In the following questions, two columns are given, containing three phrases each. A phrase from the first column may or may not connect with a phrase f...
In the following questions two columns are given containing three Sentences/phrases each. In first column, sentences/phrases are A, B and C and in the ...
Directions: Choose the combination that completes the sentences.
In each of the following questions, two columns are given containing three sentences/ phrases each. A sentence or phrase from the first column may or m...
In the following questions, you will find two columns containing three sentences each. Column 1 consists of sentences A, B, and C, with one blank in on...
In the following question, a sentence is divided in to three parts, given in column 1, 2 and 3. Match the statements from column 1 with those in column...
Relevant for Exams:
