Question Bank  Modern Math

hemant_malhotra
Director at ElitesGrid  CAT 2016  QA : 99.94, LRDI  99.70% / XAT 2017  QA : 99.975
Number of Questions: 3
Topic: Modern Math
Answer key available? : No
Source: Elite's Grid forum

hemant_malhotra
Director at ElitesGrid  CAT 2016  QA : 99.94, LRDI  99.70% / XAT 2017  QA : 99.975
Q1) In a class, students use three mobile applications  Whatsapp, Line and WeChat. The number of students who use Whatsapp, Line and WeChat is 80, 54 and 66 respectively. Twelve students use Whatsapp and WeChat, but not Line. Six students use Whatsapp and Line, but not WeChat. Twenty two students use Line and WeChat. The total number of students in the class is ten times the number of students who use all the three applications. If 16 students use none of the three applications, then find the number of students in the class.

hemant_malhotra
Director at ElitesGrid  CAT 2016  QA : 99.94, LRDI  99.70% / XAT 2017  QA : 99.975
Q2) Of the students attending a school party, 60% of the students are girls, and 40% of students like to dance. After these students are joined by 20 more boy students, all of whom like to dance, the party is now 58% girls. How many students now at the party like to dance?

hemant_malhotra
Director at ElitesGrid  CAT 2016  QA : 99.94, LRDI  99.70% / XAT 2017  QA : 99.975
Q3) In an examination, there are 100 questions. A student is awarded 12 marks for each correct answer.He loses 3 marks for each wrong answer and loses 2 marks for each unattempted question. The net score of Hari in that test is 625. The number of ways in which Hari could have attempted the exam is ?