M4maths Maths Puzzle Logical Reasoning Number Series

7 -35 -34 -3 15 16 4?

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M4maths Other Question

The cost of 3 bananas, 4 apples and 6 mangoes is Rs. 29 and the cost of 2 banas, 6 apples and 3 mangoes is Rs. 23. What is the cost of 7 bananas, 16 apples and 12 mangoes? abcd is a 4 digit nbr if we multiply it by 9 then it reverse it position i.e., dcba
[abcd*9=dcba]
can any tell what is the answer and a!=b!=c!=d