A rectangle of breadth 7 em is cut into 4 rectangles by 3 lines parallel to the base, which is of length 40 cm. If the areas of these rectangles are in the ratio 2 : 3 : 5 : 4, the area of the largest rectangle is

100

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140

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120

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Solution

The correct option is A 100

Total are of the rectangle is $40 \times 7$ .
Portion of largest area $= \frac{5}{14}$
$∴$ Largest area $= (40 \times 7) \times \frac{5}{14} = 100 c m^{2}$

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A rectangle of breadth 7 em is cut into 4 rectangles by 3 lines parallel to the base, which is of length 40 cm. If the areas of these rectangles are in the ratio 2 : 3 : 5 : 4, the area of the largest rectangle is

The correct option is A 100Total are of the rectangle is 40×7.Portion of largest area =514∴ Largest area =(40×7)×514=100cm2

The correct option is A 100

Total are of the rectangle is $40 \times 7$ .
Portion of largest area $= \frac{5}{14}$
$∴$ Largest area $= (40 \times 7) \times \frac{5}{14} = 100 c m^{2}$