a rectangle has 15 cm as its length and 150 sq..., Area, General Mathematics

Question:A rectangle has 15 cm as its length and 150 sq. cm as its area. If the area is increased to `1 1/3` times the original area by increasing its length only, than the new perimeter is :

A `50 cm` 
B `60 cm` 
C `70 cm` 
D `80 cm`

/98

+ AnswerB

+ ExplanationBreadth` = (150)/(15) cm`

             `= 10 cm`

New area` = (4/3 xx 150) sq.cm`

                `= 200 sq.cm.`

:. New length` = (200)/(10) cm`

                      `= 20 cm.`

New perimeter` = 2 (20 + 10) cm = 60 cm.

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