Answer:-26.25
Step-by-step explanation:
Recall that
which tells you that
, so in fact
Attached is an image demonstrating why the identity is true.
20 = 2 x 2 x 5
15 = 3 x 5
common divisor (CD) of 20 and 15 is 5 so n should be 5 and each group has 4 boys and 3 girls.
If there are more than one CD, then there are more than one answer.
If they ask for the largest number of groups, greatest common divisor (GCD) will be the answer.
Let x= the first digit
Let y= the second digit
X+Y=16 X-Y=18
2X=34 2X/2=34/2
X=17
17+Y=16 Y=-1
36(x)=900(100)
Cross products
36x divided by 36=90,000 divided by 36
Divide each side by 36
X=2500