Answer:
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Step-by-step explanation:
Answer:
= 1/3 * sqrt(1/2)
Step-by-step explanation:
sqrt(1/18)
We know that sqrt(a/b) = sqrt(a)/sqrt(b)
sqrt(1/18)
sqrt(1)/sqrt(18)
1/sqrt(18)
We also know that sqrt(ab) = sqrt(a) sqrt(b)
1/sqrt(18) = 1/ sqrt(9)sqrt(2)
= 1/(3sqrt(2))
= 1/3 * 1/ sqrt(2)
We know that sqrt(a/b) = sqrt(a)/sqrt(b)
= 1/3 * sqrt(1/2)
Answer:
Cost of one doughnut = $1.25
Step-by-step explanation:
Doughnut Cost
3 3.75
1 x

Answer:11
Step-by-step explanation:
Boys : girls=7:1
Sum of ratio=7+1=8
Let number of girls be y
Then number of boys=y+66
Total number of pupils=y+y+66
Total number of pupils=2y+66
girls only=(girl 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
There are 11 girls