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3 years ago

$28 lunches; 15% tip

Mathematics

2 answers:

Masja [62]3 years ago

8 0

Answer:

Paid a total of $32.20 ($28 for the lunches and $4.20 for the tip)

Step-by-step explanation:

Solve to find the amount of the tip

–Since 28 is given, all you have to do is find 15% of 28 to find how much the tip was:

15% of 28 ⇒ 0.15 × 28 = 4.2

Answer: $4.20

Solve to find the total amount paid

–Now, add 28 (amount paid for the lunches) and 4.2 (amount of the tip) together to find the total amount that was paid:

28 + 4.2 = 32.2

Final Answer: Paid a total of $32.20 ($28 for the lunches and $4.20 for a tip)

Hope this helps! :)

nikklg [1K]3 years ago

6 0

Answer: $4.20 tip

Step-by-step explanation:

15% of 28 is 4.2

Using a calculator, you can find the value of the tip by multiplying 0.15 by 28.

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Answer:

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Assume that $x\; {\rm km \cdot h^{-1}}$ is the speed of the plane in still air, and that $y\; {\rm km \cdot h^{-1}}$ is the speed of the wind.

When the plane is travelling against wind, the ground speed of this plane (speed of the plane relative to the ground) would be $(x - y)\; {\rm km \cdot h^{-1}}$ .
When this plane is travelling in the same direction as the wind, the ground speed of this plane would be $(x + y)\; {\rm km \cdot h^{-1}}$ .

The question states that when going against the wind ( $v = (x - y)\; {\rm km \cdot h^{-1}}$ ,) the plane travels $6111\; {\rm km}$ in $9\; {\rm h}$ . Hence, $9\, (x - y) = 6111$ .

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