Answer:
The only thing that is changing in the equations is the placement of the decimal.
Step-by-step explanation:
1. - 3, +4 2. +2, - 5 3. +9, +1
Let us first write down the given equation.
80 = 3y + 2y + 4 + 1
80 = 5y + 5
80 - 5 = 5y
75 = 5y
Just reversing both sides we get
5y = 75
Now dividing both sides by 5 we get
y = 15
So the value of y is 15.
I hope the procedure for solving the problem is clear to
you. In future you can solve such problems with ease following the procedure
described.
The two numbers are 12 and 16. 12 + 6 = 18. 6 doubled is 12. 12 plus 6 equals 18.
Mean number of points scored=(3+14+10+0)/4
=6.75
