Question
The length of a rectangle is 3 metres more than its
width. If the perimeter of the rectangle is 70 metres then what is the area (in m2Â ) of the rectangle?Solution
Let the width of the rectangle = ‘x’ metres Then, length of the rectangle = (x + 3) metres Perimeter of the rectangle = 2 × (length + width) Or, 2 × (x + x + 3) = 70 Or, 2x + 2x + 6 = 70 Or, 4x = 70 – 6 = 64 Or, x = 64/4 = 16 m So, area of the rectangle = x × (x + 3) = 16 × 19 = 304 m2
1648, 1690, 1741, 1807, 1938, 2140
- Find the wrong number in the given number series.
60, 75, 101, 150, 210, 285 63, 124, 215, 345, 511, 728
124, 143, 168, 202, 242, 289
1320, 1352, 1390, 1436, 1488, 1548
42, 32, 60, 48, 96, 84
- Find the wrong number in the given number series.
10, 18, 32, 52, 78, 110 5, 32, 16, 140, 105, 448
896Â Â Â 2688Â Â Â 336Â Â Â 1008Â Â Â 124Â Â Â 378
Find the wrong number, in the given number series,
70, 56, 42, 30, 20, 12