In a class 7/48 of students got an A from math. and 1/12 of class got an A from both math. and physics. Which of the followings is true ?
Have a look at ry1 . Just to get acquainted with set theory .
The simplest group consists of 4 girls each having an age of 13 and 8 boys each being 10 years old. 1/4 of the girls is a girl with most probable age of 13
The inverse of a digit D is 1/D . The question is very simple indeed and you have to see the structure and pinpoint the digits very quickly. This means
gaining precious time.
The first 9 elements are the 9 digits. So for the other 45 numbers there are 90 digits . 10th digit is tens' of 10, i.e. 1. 30th digit is 2 and 50th digit 3.
90th digit is 5.
These type of problems are more easily solved by trial and error. Just try the answers .
Let he amount of mixture be B at the beginning and E at the end. We have to find 2 equations:
1. E = B - 20 .
2. (3/10)xE + 20 = B/2.
Putting 1 in 2 we have (3/10)x(B-20) + 20 = B/2 which means B/2 - 3xB/10 = 14
Learn 3-4-5 triangle, it is important. Have please a look at ry1 for the rest.
The question reduces to 1/12 + 1/20 + 1/30 = ?
The last two are around 1 whereas the first two are around a half .
The first two are 7 and 8 .
5/(A+5) ≥ 1/2 .
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