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If 137 + 276 = 435 how much is 731 + 672 ?

If 137 + 276 = 435 how much is 731 + 672 ? (A) 534 (B) 1403 (C) 1623 (D) 1531

  • Amit
  • 28620 Views
  • 7 Answers
  Answer
7 Answers

  • B

    0

  • (C) 1623br /br /br / 

    0

  • 1623

    1

  • Option C is the answer. Since the given sum is added by 20 in the question. In the same way 220 is added to the sum in the next question..

    1

  • not clear

    0

  • A

    8

  • First look at the ones digit. Something that ends in 7 plus something that ends in 6 usually ends in 3.  But in this case the answer ends in 5,  so we must not be working in base 10!  Instead, 6+7=13 must be 5 plus a multiple of our base. So either it's base 8, base 4, or base 2.  But it can't be base 4 or base 2, since some of the digits are bigger than 4. The only possibility left is base 8. br /br /So is it really base 8?  Let's check:br /br /6+7 = 13 (base 10) which is 15 (base 8).  So write down a 5 and carry the one.br /3+7+1 = 11 (base 10), which is 13 (base 8). Write down a 3 and carry the one.br /1+2+1=4.   br /br /So 137 (base 8) + 276 (base 8) = 435 (base 8). So far so good! br /br /Now do the other addition base 8:br /br /1+2=3, so the last digit is 3br /3+7=10 (base 10) = 12 (base 8), so the next digit is 2.  Carry the 1. br /7+6+1 = 14 (base 10) = 16 (base 8). 

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