Please help on these questions, thanks.

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12.

Let B be cost of blouse.

Let T be cost of t-shirt.Â T = B-15

Let S be cost of skirt. S = B+9

So, 2B + 3T + 2S = 267

=> 2B + 3(B-15) + 2(B+9) = 267

=> 2B + 3B – 45 + 2B + 18 = 267

=> 7B – 27 = 267

=> 7B = 267 + 27 = 294

=> B = 294/7 = **$42 #**

13.

(1) E + M = 175

(2) E + S = 164

(3) M = E – 11

Substituting (3) into (1)

E + (E – 11) = 175

2E = 175 + 11 = 186

E = 93

So, in (2), we get

E + S = 164

=> 93 + S = 164

=> S = 164 – 93 = **71 #**

14.

3T + 5(T-5) = 87

3T + 5T – 25 = 87

8T = 87 + 25 = 112

T = **14 #**

15.Â

Let P be the cost of a pot.

Let L be the cost of a plate.

(1) P + 9L = 78

But (2) P = 4L

Substituting (2) into (1),

4L + 9L = 78

13L = 78

L = 6

So (2) gives P = 4L = 24

So cost of 2 pots and 1 plate is: 2P + L = 2(24) + 6 = **$54 #**

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