1.

Divide the sum of minus 12 by 7 and 13 by 5 by the product of minus 1 by 3 into 31 by 7

Answer»

Sum of - 12/7 & 13/5 =
-12/7 + 13/5 ( Take LCM)
(-60+91) / 35
= 31/35

Product of -1/3 × 31/7 =
-31/21

As PER GIVEN condition
31/35 ÷ -31/21

(Since, There are two numerator and two denominator :-
a = 31, b = 35, C = -31 & d = 21

Do a×d / b × c)

= 31×21 = 35 = -31
= 21/-35
= 3/-5 or -0.6.

Hope it helps.
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