Answer:
Step-by-step explanation:
This is what I got
Answer:
n=10
Step-by-step explanation:
Add 7 to 3
It should be 13 since 13+8 = 21. 21-7 = 13
$192 divided by 12 is 16 so 16 x 3 is 48. That is your answer $48. Your welcome bud.
Answer:11
Step-by-step explanation:
Boys : girls=7:1
Sum of ratio=7+1=8
Let them number of girls be y
Then they number of boys=y+66
Total number of pupils=y+y+66
Total number of pupils=2y+66
Number of girls=(girls ratio)/(sum of ratio) x (total number of pupils)
y=1/8 x (2y+66)
Cross multiply
y x 8=2y + 66
8y=2y + 66
Collect like terms
8y-2y=66
6y=66
Divide both sides by 6
6y/6=66/6
y=11
The number of girls is 11
