Question
There are 4 children in a family. The average age of the
children is 9 years. If the present age of their mother and father is added, the average age of the whole family becomes 15 years. If the age of the father is 4 years more than that of the mother, find the present age of the mother.Solution
ATQ, Let the present age of the mother be x years. So, the present age of the father = x+4 years. Sum of the present age of the four children = 9×4=36 years. Sum of the present age of the whole family = 36+x+(x+4)=15×6. 2x+4=90−36 2x=50 x=25 Therefore, the present age of the mother = 25 years.
6 2 8 ? 84 416
...89 78 74 67 63 ?
12 156 256 320 356 ?
...32 63 121 ? 453 889
...A’ is the nth term of the given series and ‘B’ is the (n + 1)th term of the given
series. Choose the correct statement from the following s...
315 146 267 ? 235 210
D irection: Which of the following will replace ‘?’ in the following series
9, ‘?’, 1242, 1581, 1783
...14 15 34 116 460 2325
...3601 3602 1803 604 154 36
...261 256 246 231 211 ?
...
