Question
How old is Jack? I. After 20 years, Jack will be
twice as old as he is today. II. Five years ago, Jack was ¾ times of his present age. Each of the following questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give the answer.Solution
Let Jack’s current age be x years, From I, x + 20 = 2x x = 20 From II, x – 5 = ¾ x 4x – 20 = 3x x = 20 Thus, either of statements alone is sufficient to answer the given question.
In a group of 5 boys and 4 girls, 5 students have to be selected. In how many ways it can be done so that only 2 boys are included.
Five articles out of which 3 are cups and rest are glasses have to be arranged on a shelf. Find the number of ways of arrangement in which all three cup...
6 students appear in an examination. In how many ways can the result be announced?
Find total number of ways in which the word “ACCOMMODATE” can be arranged.
How many 5-digit even numbers can be formed using the digits 0 to 9 if no digit is repeated?
- Eight books out of which 4 are part of a series and the remaining are standalone books are to be arranged on a shelf. Find the number of arrangements in wh...
- Seven balls out of which 4 are red and the rest are green are to be arranged in a row. Find the number of arrangements in which all four red balls are not ...
What will be the number of permutations of n different things, taken r at a time, where repeatition is allowed?
- There are 3 identical toys and 4 identical books. How many distinct arrangements are possible on a shelf such that all three toys do not appear together?
Find the no. of words formed by using all the letter of the word DISCOUNT, so that the vowels are never together?