the suraface area of a cuboid having length 20 cm and 7 cm high is 760 cm 2.find the breadth of the cuboid
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S.A OF Cuboid =760
=2(L×b+b×h+l×h)=760
=2(20×b+b×7cm+20×7)=760
2(20b+7b+140)=760
40b+14b+280=760
54b=760-280
54b=480
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