It's 52. :)
13x4=52
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13 less than 4 times a number 13 less than is "-13" 4 times a number is "4x" 4x-13■
It is: 4 times 13 equals 52
13 times with a remainder of 4
16 x 4 = 64 77 - 64 = 13 4 times with 13 remaining
13 times with 4 remainder.