IGCSE Mathematics Paper-1: Specimen Questions with Answers 120 - 123 of 324

Question 120

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Short Answer▾

Solve the linear equations

Explanation

Here,

Linear equations are those who have the unique solutions.

Equations are

Now, add equation (II) into (I) ,

Now, multiply equation (III) by 2 and add into (II) ,

Now, put into equation (IV) ,

Now, put and into equation (I) ,

Thus,

Question 121

Describe in Detail

Essay▾

Solve with detailed working:

(a)

(b)

Explanation

Here,

(a) Left Hand Side (LHS) =

Right Hand Side (RHS) =

Thus, LHS = RHS.

(b) Left Hand Side (LHS) =

Right Hand Side (RHS) = .

Thus, LHS = RHS.

Question 122

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Short Answer▾

Ravi՚s height is 159 cm, to the nearest centimeter. Complete the statement about the limits of his height.

Explanation

Here, He is greater than or equal to 158.5 centimeters but less than 159.5 centimeters.

In mathematical form:

Question 123

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Short Answer▾

The image shows Indian Flag.

Indian Flag Showing Its Length and Width

(a) Given that length of Indian Flag is 1.5 times more than that of width, if width of flag is 60 cm, find length of the Indian flag.

(b) If ratio of width and length of flag is 2: 3, if length is 900 mm, find width of the flag.

Explanation

Here,

(a) Length of Indian Flag is 1.5 times more than that of width and width of flag is 60 cm.

So, 2 times means , but here 1.5 times means .

So, length will be 90 cm.

(b) Here, ratio of width and length of flag is 2: 3.

Length is 900 mm. let՚s take width = w.

So, ratio will be: .

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