>>81689635 (OP)Here is how to solve it (From a 138 IQ guy, before reading any message in the thread. Also assuming the numbers are positive and integers):
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1) Look at the first 3 lines and determine the minimum and maximum value for each fruit:
-Pineapple: 0~7
-Grape: 2~7 (OK; It cannot be lower than 2, becaue Pineapple + Grape = 9 and we know pineapple is between 0~7)
-Apple: 0~7
2) Since Grape is between 2~7, then:
-Max Value (Apple) = 19 - 2x2 = 15
-Min Value (Apple) = 19 - 2x7 = 5
3) We know Apple can't be higher than 7 (Because Apple + Pineapple = 7), so:
OK: Apple is between 5 and 7.
OK: Grape is between 2 and 7.
4) Since we know that since Apple + Pineapple = 7 and Apple is between 5 and 7, then:
OK: Pineapple is between 0 and 2.
UPDATE: Grape is 7, because Pinneapple can't be higher than 2.
UPDATE: Apple is 5, since 2x Grapes + Apple = 19
UPDATE: Pineapple is 2.
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ANSWER: 7 + 5 + 2 = 14