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## Question

primary 5 | Maths
| Whole Numbers

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Pls explain c

① Figure number and the number of white rectangles in the figure are always the same.

②Number of dark rectangles is always twice of the number of white rectangles in each figure.

③Number of stars is always one more than number of dark rectangles in each figure.

So if you let number of white rectangles be 1 unit,

Then ,

dark rectangles = 2 units

Stars = 2 units + 1

Total = 1 unit + 2 units + 2 units + 1

= 5 units + 1

5 units + 1 = 621

5 units = 620

1 unit = 124

So the figure number is 124 since 1 unit is the number of white rectangles

### See 1 Answer

Number of rectangles = 3 x 59 = 186

Number of stars = 58 x 2 + 3 = 119

Total shapes = 119 + 186 = 305

Part b:

429/3 = 143

Part c:

Total number of shapes = Rectangles + Stars = (3+3) + (3+2) = 3+3+5n

n = number of sequence

621-3-3=615

615/5 = 123

n = 123 (Ans)

The total number of shapes = 5n + 1 , not 5n + 6