25% people in a group join a mountaineering activity,while the remaining 45 people do not join it. How many people are there in the group ?
To find the total number of people in the group, we need to use the information that 25% of people join the mountaineering activity and the remaining 45 people do not join.
Let's assume the total number of people in the group is "x".
If 25% of people join the activity, then 75% of people do not join. We can find 75% of "x" by multiplying x by 0.75.
So, the number of people who do not join the activity is 0.75x.
We are given that the number of people who do not join the activity is 45.
Therefore, we can set up the equation:
0.75x = 45
To solve for x, divide both sides by 0.75:
x = 45 / 0.75
Calculating this, we find:
x = 60
Hence, there are 60 people in the group.
so 75% would be 45
.75x = 45
x = 45/.75 = ...