A dress costs $60. A skirt costs 25% less. M bought some skirts and dresses for $2220. 70% of the items were dresses. Rest were skirts. How much do skirts cost? (All the skirts together.)

$2220 = 60*D + 45*(3/7)D

Solve for D, the number of dresses.
(3/7)D is the number of skirts bought, since 30% were skirts and 70% dresses. $45 is the cost per skirt.

Solve for D. (It should be an integer). Multiply that by $60 for the amount spend on dresses.

I get $1680.

Let's break down the problem step by step:

1. The dress costs $60.
2. The skirt costs 25% less, which means skirts cost 75% of the dress price.

To calculate the price of the skirt, we first need to find 75% of $60.

Step 1: Calculate the skirt price:
Skirt price = 75% of $60
= 0.75 * $60
= $45

So, each skirt costs $45.

3. M bought some dresses and skirts for a total of $2220.
4. 70% of the items were dresses, which means 30% were skirts.

Now, let's find out the total number of skirts purchased.

Step 2: Calculate the number of skirts:
Skirts' share = 30% of total cost
= 30% of $2220
= 0.30 * $2220
= $666

So, the total cost of all the skirts purchased is $666.

Step 3: Calculate the cost of each skirt:
Cost of each skirt = Total cost of skirts / Number of skirts
= $666 / Number of skirts

Since the total cost of the skirts is $666, and we want to find the cost of each skirt, we need to divide $666 by the number of skirts. Unfortunately, we don't have the exact number of skirts (only the percentage). Therefore, it is not possible to determine the exact cost of each skirt based on the given information.

To find the cost of the skirts, we first need to determine the number of dresses and skirts purchased.

Let's assume the number of dresses is D, and the number of skirts is S.

We know that 70% of the items were dresses, so 70% of (D + S) must equal D:

0.70(D + S) = D

Simplifying this equation, we get:

0.70D + 0.70S = D

0.30D = 0.70S

Next, we can use the given information that the cost of a skirt is 25% less than the cost of the dress.

The cost of a skirt is therefore 100% - 25% = 75% of the cost of a dress.

Since the dress costs $60, the skirt costs 75% of $60:

Skirt cost = 0.75 * $60 = $45.

Now, let's consider the total cost of M's purchase.

The cost of D dresses is D * $60, and the cost of S skirts is S * $45.

Since the total cost of M's purchase is $2220, the equation is:

D * $60 + S * $45 = $2220

Now, we have two equations:

0.30D = 0.70S

D * $60 + S * $45 = $2220

To solve these equations, we can use substitution or elimination.

Let's use substitution:

From the first equation, we can isolate D to find D = (0.70S) / 0.30.

Substituting this value of D in the second equation, we have:

[(0.70S) / 0.30] * $60 + S * $45 = $2220

Now, we can solve this equation to find the value of S, which represents the number of skirts.

Solving algebraically:

[42S / 3] + 45S = 2220

42S + 135S = 6660

177S = 6660

S = 6660 / 177

S ≈ 37.63

Since we can't have a fraction of a skirt, we'll round this to the nearest whole number.

Therefore, the number of skirts, S, is approximately 38.

Finally, let's assess the cost of the skirts:

Skirts cost = 38 * $45 = $1710.

Hence, the cost of all the skirts together is $1710.

D*60 + S(60*.75)=2220

.7(D+S)=D

Can you take it from here?