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i. The number of students who passed Mathematics.
ii. The number of students who passed Science.
iii. The number of students who passed exactly one of the two subjects.

b)
i) The exterior angles of a polygon are [tex]25^{\circ}, 43^{\circ}, 142^{\circ}, 4x^{\circ}[/tex], and [tex]x^{\circ}[/tex]. Find the value of [tex]x[/tex].

ii) Rachael wants to order mathematics textbooks over the internet. Each textbook costs Ghc [tex]x[/tex] and shipping for the entire order is Ghc 30.00. Rachael has no more than Ghc 530.00.

(a) Write an inequality that represents Rachael's situation.
(b) How many textbooks can Rachael order without exceeding her Ghc 530.00 limit?

c) A man bought a car for Ghc 15,000.00. He later sold it at a profit of [tex]20\%[/tex]. What was the selling price?


Sagot :

Let's break down the solution to answer each part of the question step-by-step:

a) i. The number of students who passed Mathematics:

The number of students who passed Mathematics is \( \mathbf{30} \).

ii. The number of students who passed Science:

The number of students who passed Science is \( \mathbf{25} \).

iii. The number of students who passed exactly one of the two subjects:

The number of students who passed exactly one of the two subjects is \( \mathbf{10} \).

b) i) Finding the value of \( x \) given the exterior angles of a polygon:

The exterior angles of a polygon are given as \( 25^\circ \), \( 43^\circ \), \( 142^\circ \), \( 4x^\circ \), and \( x^\circ \).

The sum of all exterior angles of any polygon is always \(360^\circ\). Hence, we can set up the equation:

[tex]\[ 25^\circ + 43^\circ + 142^\circ + 4x^\circ + x^\circ = 360^\circ \][/tex]

Combining like terms, we get:

[tex]\[ 210^\circ + 5x^\circ = 360^\circ \][/tex]

Solving for \( x \):

[tex]\[ 5x^\circ = 150^\circ \][/tex]

[tex]\[ x = \frac{150^\circ}{5} = 30^\circ \][/tex]

So, the value of \( x \) is \( \mathbf{30^\circ} \).

b) ii) Rachael's textbook order:

Rachael wants to order textbooks online, where:
- Each textbook costs \( Gh \)
- The shipping cost for the entire order is \( Ghc 30.00 \)
- Rachael has no more than \( Ghc 530.00 \)

(a) Write an inequality that represents Rachael's situation:

Let \( n \) represent the number of textbooks Rachael can order. The total cost of the textbooks plus the shipping cost should be less than or equal to her budget, i.e.,

[tex]\[ n \cdot Gh + 30 \leq 530 \][/tex]

(β) How many textbooks can Rachael order without exceeding her Ghc 530.00 limit?

First, set up the inequality:

[tex]\[ n \cdot Gh + 30 \leq 530 \][/tex]

Subtracting 30 from both sides:

[tex]\[ n \cdot Gh \leq 500 \][/tex]

Dividing both sides by the cost per textbook \( Gh \):

[tex]\[ n \leq \frac{500}{Gh} \][/tex]

Thus, the number of textbooks Rachael can order without exceeding her budget is \( \mathbf{\frac{500}{Gh}} \).

c) Selling price of the car:

A man bought a car for \( Ghc 15,000.00 \) and sold it at a profit of 20%. To find the selling price:

The profit amount is:

[tex]\[ \text{Profit amount} = 15,000 \times \frac{20}{100} = 3,000 \][/tex]

The selling price is then:

[tex]\[ \text{Selling price} = \text{Purchase price} + \text{Profit amount} = 15,000 + 3,000 = 18,000 \][/tex]

So, the selling price of the car is [tex]\( \mathbf{Ghc 18,000.00} \)[/tex].