How can anyone have doubt in this question.
Square of 3= 9
Square of 5= 25
Square of 7= 49
Total is = 83
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You mean : 7*(3+5)=7*8=56
12 x 5 = 60
22 + 32 + 52 + 72 = 4 + 9 + 25 + 49 = 87
The sum of 3/5 and 7/5 is 10/5, which simplifies to 2.
16