Answer:
20
Step-by-step explanation:
Set up 3/5 = 12/x and cross multiply
3x=60
Divide by 3
x=20
Answer:
36 boys
Step-by-step explanation:
let x be the number of pupils in the class , then
x + 24 = x ( multiply through by 5 to clear the fraction )
3x + 120 = 5x ( subtract 3x from both sides )
120 = 2x ( divide both sides by 2 )
60 = x
Then
number of boys = × 60 = 3 × 12 = 36
Step-by-step explanation:
464.5cm³
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The answer is 1:3. You have to divide by the greatest number possible. In this case it is 2. So you divide 2 by 2, and 6 by 2.
Answer:
Area of the flower garden = 31.75 square meters
Step-by-step explanation:
Circumference of the circle shaped flower garden = 20 meters
Now, The circumference of circle = 2π × radius
⇒ 2π × radius = 20
⇒ π × radius = 10
⇒ radius = 3.18 meters
Area of the flower garden = π × radius²
⇒ Area of the flower garden = 3.14 × 3.18²
⇒ Area of the flower garden = 31.75 square meters