Tina bought a scarf for $16.65. She gave the clerk $20. How much change should she get back?

Consider the given inequality:
4x − 12 < 12
4x < 12 + 12
4x < 24
Divide by 2 on both sides, we get:
2x < 12

First, convert 15,140 drops to seconds using the ratio given:
15,140 drops × \(\frac{4sec}{1drop}\) = 60,560 sec.
Now convert seconds to hours:
60,560 sec × \(\frac{1min}{60sec}\) × \(\frac{1hr}{60min}\) = 16.82 hr.
Convert the remainder of hours back to minutes and seconds:
0.82 hr. × \(\frac{60min}{1hr}\) = 49.2 min.
0.2 min × \(\frac{60sec}{1min}\) = 12 sec.
16 hours, 49 minutes, 12 seconds.

15 apples are three times as many as 5 apples, so 15 apples will cost 3 × $2 = $6.

Add the number of cupcakes he will give to his friend and to his coworkers, then subtract that value from 48.
the number of cupcakes for his friend:
1/2 × 48 = 24
the number of cupcakes for his coworkers:
1/3 × 48 = 16
48 − (24 + 16) = 8

Step 1: Interpret the problem
First, we must understand what is happening in this situation. To find the number of marbles that Steven has, we need to multiply the number of marbles Max has by 0.2.
Step 2: Calculate the number of marbles that Max has
Since Max has 2.5 times the number of marbles Jacob has, we can multiply the number of marbles Jacob has by 2.5.
Remember, with decimals, we pretend as if the decimals are not there. We do not line up numbers by their decimal point.
Put the Decimal Place in the Right Location
Since there is 1 number to the right of the decimal point in the problem, there will be 1 number that is behind the decimal in the product. Therefore, the decimal point goes between 5 and 0. => 85.0
Since the 0 is after the decimal point, it can also be dropped since it has no value.
So, Max has 85 marbles.
Step 3: Calculate the number of marbles that Steven has
To find the number of marbles Steven has, we can multiply the number of marbles Max has by 0.2. Remember, with decimals, we pretend as if the decimals are not there. We do not line up numbers by their decimal point.
Put the Decimal Place in the Right Location
Since there is 1 number to the right of the decimal point in the problem, there will be 1 number that is behind the decimal in the product. Therefore, the decimal point goes between the 7 and the 0. => 17.0
Since the 0 is after the decimal point, it can also be dropped since it has no value.
So, Steven has 17 marbles.

\(\frac{\mathrm{12.8} }{\mathrm{64}}\) = 0.20.
0.20= \(\frac{\mathrm{20} }{\mathrm{100}}\), reduce \(\frac{\mathrm{20} }{\mathrm{100}}\) to \(\frac{\mathrm{1} }{\mathrm{5}}\).

There are twice as many red marbles as blue marbles, so (red) = 2(blue).
The number of blue marbles is 88% of the number of green marbles, so (blue) = 0.88g.
Substitute this expression for blue marbles in the one above:
(red) = 2(0.88g)
(red) = 1.76g
The total number of marbles is equal to red plus blue plus green:
(red) + (blue) + 1g
1.76g + 0.88g + 1g = 3.64g