IGCSE Mathematics Paper-1: Specimen Questions with Answers 169 - 170 of 324

Question 169

Write in Short

Short Answer▾

Oil is sold in two sizes, 500 ml and 1 liter.

Two Different Quantities Oil Bottles

A contains 500ml and costs $ 1.50. B contains 1 liter and costs $ 2.60. Which is the better value for money?

Explanation

Here,

Bottle A contains 500 ml for 1.50 dollars and B contains 1 liter and costs $ 2.60.

So, for comparison of both bottles we need to convert liter into ml.

Now, for B: 1 liter (1000 ml) = 2.60 dollars

So, Money for 500 ml = ? dollars

Thus, money for 500 ml for A = 1.50 dollars and money for 500 ml for B = 1.3 dollars which is less than A.

So, better value is of B which is 1 liter and costs $ 2.60.

Question 170

Write in Short

Short Answer▾

for the shape shown,

The Coloured Square

Write down

(a) The number of lines of symmetry,

(b) The order of rotational symmetry

Explanation

Here,

(a) If we can reflect a figure over a line and the figure appears unaffected, then the figure has reflection symmetry or line symmetry.

  • The line that you reflect over is called the line of symmetry.
  • A line of symmetry divides a figure into two mirror-image separations.
  • The number of lines of symmetry of a square is 4 because it has four equal sides by reflecting all we can get same image as it is.

(b) The order of rotational symmetry of square is also 4 because when we rotate it, it will see in same position as shown in given figure for four times.

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