Solve the following problems: 1. Solve for x: 2x − 1 = 11. 2. Convert ₵45.62 to pesewas. 3. Calculate the amount paid after a 30% discount on ₵200. 4. Solve for x: 2 x 9 = 648. 5. Calculate the perime

$$2x - 1 = 11$$

Add 1 to both sides:

$$2x = 11 + 1$$ $$2x = 12$$

Divide by 2:

$$x = \frac{12}{2}$$ $$x = 6$$

The value of $x$ is $\boxed{6}$.

Assuming "bo" is a typo for "pesewas" and ₵1 = 100 pesewas.

$$45.62 \text{ Cedi} \times 100 \frac{\text{pesewas}}{\text{Cedi}} = 4562 \text{ pesewas}$$

₵45.62 is equal to $\boxed{4562 \text{ pesewas}}$.

Original cost = ₵200
Discount = 30%
Discount amount = $30\%$ of ₵200

$$0.30 \times 200 = 60$$

Discount amount = ₵60
Amount paid = Original cost - Discount amount

$$200 - 60 = 140$$

The buyer will pay $\boxed{₵140}$.

Assuming the equation is $2 \times x \times 9 = 648$.

$$18x = 648$$

Divide by 18:

$$x = \frac{648}{18}$$ $$x = 36$$

The value of $x$ is $\boxed{36}$.

Length ($L$) = 100 m
Breadth ($W$) = 50 m
Perimeter ($P$) = $2(L + W)$

$$P = 2(100 \text{ m} + 50 \text{ m})$$ $$P = 2(150 \text{ m})$$ $$P = 300 \text{ m}$$

The perimeter of the rectangular field is $\boxed{300 \text{ m}}$.

A rhombus has four equal sides. Assuming the side length is 5 cm (taking the first value given, as "5cm by 8cm" is contradictory for a rhombus).
Side length ($s$) = 5 cm
Perimeter ($P$) = $4s$

$$P = 4 \times 5 \text{ cm}$$ $$P = 20 \text{ cm}$$

The perimeter of the rhombus is $\boxed{20 \text{ cm}}$.

Selling Price (SP) = ₵14
Profit = 40%
Let Cost Price (CP) be $x$.
SP = CP + Profit
SP = CP + (Profit % of CP)

$$14 = x + 0.40x$$ $$14 = 1.40x$$

Divide by 1.40:

$$x = \frac{14}{1.40}$$ $$x = 10$$

The cost price is $\boxed{₵10}$.

Ratio = 18:45
Find the greatest common divisor (GCD) of 18 and 45.
Factors of 18: 1, 2, 3, 6, 9, 18
Factors of 45: 1, 3, 5, 9, 15, 45
The GCD is 9.
Divide both parts of the ratio by 9:

$$\frac{18}{9} : \frac{45}{9}$$ $$2 : 5$$

The ratio in its lowest term is $\boxed{2:5}$.

Total amount = ₵48
Ratio A:B:C = 2:3:5
Total ratio parts = $2 + 3 + 5 = 10$
C's share = $\frac{\text{C's ratio part}}{\text{Total ratio parts}} \times \text{Total amount}$

$$\text{C's share} = \frac{5}{10} \times 48$$ $$\text{C's share} = \frac{1}{2} \times 48$$ $$\text{C's share} = 24$$

C's share is $\boxed{₵24}$.

Principal (P) = ₵800
Amount (A) = ₵960
Interest (I) = A - P = ₵960 - ₵800 = ₵160
Interest Rate (R) = 5% per annum = 0.05
Simple Interest formula: $I = P \times R \times T$

$$160 = 800 \times 0.05 \times T$$ $$160 = 40 \times T$$

Divide by 40:

$$T = \frac{160}{40}$$ $$T = 4$$

The money was in the bank for $\boxed{4 \text{ years}}$.

Assuming the conversion rate is £1 = ₵300.
Amount in Cedi = ₵27,000
Amount in Pounds = $\frac{\text{Amount in Cedi}}{\text{Cedi per Pound}}$

$$\text{Amount in Pounds} = \frac{27000}{300}$$ $$\text{Amount in Pounds} = 90$$

You could get $\boxed{£90}$.

Cost Price (CP) = ₵75
Selling Price (SP) = ₵63
Since SP < CP, there is a loss.
Loss = CP - SP

$$75 - 63 = 12$$

The loss is $\boxed{₵12}$.