The number of seconds that it takes for a kettle to boil, $n$ , is inversely proportional to its power in kilowatts, $p$ .
The equation of proportionality is
$n = \frac{270}{p}$
Work out the power of the kettle if it takes 90 seconds to boil.
If your answer is a decimal, give it to 1 d.p.

Answer

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Answer

$3.0$ is the power of the kettle in kilowatts.

Steps

Step 1 ：Given that the number of seconds to boil, $n$ , is inversely proportional to the power in kilowatts, $p$ . The equation of proportionality is $n = \frac{270}{p}$

Step 2 ：We need to find the value of $p$ when $n = 90$ seconds. Substitute $n = 90$ into the equation:

Step 3 ： $90 = \frac{270}{p}$

Step 4 ：To solve for $p$ , multiply both sides by $p$ and then divide by 90:

Step 5 ： $p = \frac{270}{90}$

Step 6 ： $p = 3.0$

Step 7 ： $3.0$ is the power of the kettle in kilowatts.

The number of seconds that it takes for a kettle to boil, n, is inversely proportional to its power in kilowatts, p.The equation of proportionality isn=270pWork out the power of the kettle if it takes 90 seconds to boil.If your answer is a decimal, give it to 1 d.p.

Answer

Popular Problems

The number of seconds that it takes for a kettle to boil, $n$ , is inversely proportional to its power in kilowatts, $p$ .
The equation of proportionality is
$n = \frac{270}{p}$
Work out the power of the kettle if it takes 90 seconds to boil.
If your answer is a decimal, give it to 1 d.p.