According to my calculations the 30% of 570 is 171
10% of 570 is 57
times that by 3 and you get 171
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The total area of the blades is the area of a triangle multiplied by 4.
We have then:

Where,
b: base of the blades
h: height of the blades
Substituting values we have:

Doing the calculation we have that the area of the blades is given by:

Answer:
The total area of the blades is:

Answer:
20
Step-by-step explanation:
Compute the division left to right first, and then the addition/subtraction left to right!