Please see the attachment. I am sorry to say that the answer by u is not correct . the answer is 390 sq metre. Please look at the steps carefully.
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you are right dear...i already told that
listen it is correct but incomplete after that we have to subtract 630 from 390
dear,then u are actually finding the area that is Not to be covered with grass.!!!
yup we have to find that only becoz they have told laid with grass