Total in each case = 15.
and (6 + 2 + 10 + 8) - 2 = 24
Therefore, (4 + 14 + 12 + 10) - 2 = 38.
79 - (38 + 4) = 37
Therefore, 67 - (16 + X) = 42
X = 9
From II row, 2 + (2/3) = 8/3
From III row, 3 + ? = 19/5
? = (19/5) - 3
? = (4/5).
10 - 4 = 6
18 - 10 = 8
18 - 4 = 14
For second triangle,
14 - 8 = 6
22 - 14 = 8
22 - 8 = 14
For third triangle,
11 - 5 = 6
15 - 11 = 4
15 - 5 = 10.
and 789 - 543 = 246
Similarly, 863 - 241 = 622.
and (6 + 8)/2 = 7
Therefore (8 + 4)/2 = 6.
and 1 + 3 + 5 + 8 = 17
Similarly, 1 + 4 + 6 + 9 = 20.
(2 x 5 - 4) = 6
(4 x 5 - 9) = 11.
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