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2 years ago

Christian

Mathematics

1 answer:

Ratling [72]2 years ago

4 0

Step-by-step explanation:

Ariana and Mackenzie exercised for 20 minutes more than Brinley and Seth.

x = Seth exercise minutes

Ariana minutes = 3x

Brinley minutes = 3x - 17

Mackenzie minutes = 1/2 × (3x - 17)

so, in total we have

3x + ½(3x - 17) = x + (3x - 17) + 20

statement 1 is true.

6x + (3x - 17) = 2x + 2(3x - 17) + 40

6x + 3x - 17 = 2x + 6x - 34 + 40

9x - 17 = 8x + 6

x = 23

statement 2 is false.

Brinley and Seth exercised together for

x + 3x - 17 = 23 + 3×23 - 17 = 4×23 - 17 = 75 minutes

statement 3 is false.

Mackenzie exercised for

½(3x - 17) = ½(3×23 - 17) = ½(69 - 17) = ½×52 = 26 minutes

statement 4 is true.

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