Question

4+6+7=242854
6+6+7=364217
6+7+8=424828
7+5+8 ?

Answer 1

I m sorry i could not guess the secound last digit
The answer is 3556_8
Finding 1st and 2nd digit:multiply the 1st and 2nd digit in the question(7×5=35)
Finding 3rd and 4th digit:multiply the 1st and 3rd digit in the question(8×7=56)
Finding the last digit:add first and third digit of the answer(3+5=8)
Sorry couldnt find the secound last digit..i ll let u know once.i figure it out