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80

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Yes because 5+5=10 so you just add 1

1/3 + 2/5 = 11/15

basically you asked what -28+21 which equals -7

Eleven- fifths plus four- fifths equals fifteen- fifths, which reduces to three wholes. (11/5+4/5=15/5, or 3/1)

10+1, 9+2,5+6,7+4.

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11

It does if you are counting in base 9. 5 plus 5 equals 1 nine and a remainder of 1.

1/5+1/11 = 11/55+5/55 = 16/55

x = 5, y = -1

Yes because 5+5=10 so you just add 1

-11

5 plus 25 equals 60. Need to solve for 5 plus 25 equals ?: 2 plus 10 equals 24 is equivalent to 2 × (1 plus 5) equals 2 × (12); and 3 plus 15 equals 36 is equivalent to 3 ×(1 plus 5) equals 3 × (12); thus 5 plus 25 equals ? is equivalent to 5 × (1 plus 5) equals 5 × (12); thus ? = 5 × 12 = 60.

yes there is.-5x+1=-10-5x=-11-x=-11/5x=11/5

-5x + 1 = -10 -5x = -11x = 11/5 = 2 1/5

( 2 - 3 ) + ( 1 - 6 ) + ( 1 - 6 ) = ( -1 ) + ( -5 ) + ( -5 ) = -11

1/3 + 2/5 = 11/15

11 equals 6 when 11 is in the base of five, thus representing 1 times 5^1 plus 1 times 5^0 which is 6

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