---------------------------------------------- Define x: ---------------------------------------------- Let x be the number of students in the second class: ⇒second class = x
There are 3 more students in the first class than in the second class: ⇒first class = x + 3
There are 2 more students in the third class than in the second class: ⇒third class = x + 2
---------------------------------------------- Expression for each class: ---------------------------------------------- First class = x + 3 Second class = x Third class = x + 2
---------------------------------------------- Expression for total number of students: ---------------------------------------------- Total = x + 3 + x + x + 2 Total = 3x + 5
---------------------------------------------- Find x: ---------------------------------------------- There are 80 students in total, so 3x + 5 = 80 3x = 75 x = 25
---------------------------------------------- Find the number of students in each class: ---------------------------------------------- First class = x + 3 = 25 + 3 = 28 Second class = x = 25 Third class = x + 2 = 25 + 2 = 27
-------------------------------------------------------------------------------------------- Answer: There are 25 students in the second class. --------------------------------------------------------------------------------------------
You should write equation for this if we put x as the number of students in the second class then the equation will be : now you can find the value of x: the number of students in the second class is 25
using the two angles in the triangle, 1 and 2, it can be 180- the sum of angles 1 and 2, which is c. using angle 4, it can also be 180 - the equation for angle 4
Number of trials 'N' = 12 ; Probability of success (difference between speakers) 'p' = 1/2 or 0.5 ; Probability of failure (no difference b/w speakers) = 1/2 or 0.5 ; No of success 'r' = 3