27.

Cost of 4 roses = 3*3 = 9
Cost of 1 rose = 3
For 14 roses, she needs to pay for 3 bundles of 4 roses and 2 stand alone roses.
So it is 3 x 9 + 2*3 = 27 + 6 = $33

26.

Let m be the money George has.
Let t be the cost per toy soldier.

m – 17t = -50
=> (1) m = 17t – 50

m – 12t = 35
=> (2) m = 12t + 35

Placing (1) and (2) together,
17t – 50 = 12t + 35
5t = 85
t = 17

So m = 17(17) – 50 = $239 #

25.
Let m be the amount of money Fiona has.
Let p be the cost of each scarf.

m – 15p = -80
=> (1) p = (m + 80)/15

m – 9p = 64
=> (2) p = (m – 64)/9

So,
(m + 80)/15 = (m – 64)/9
9m + 720 = 15m – 960
6m = 1680
=> m = $280

24. 

(856 – 271) / 9 = 65 cm #