Sunday, November 22, 2015

Math

Problem:



(6 - 10) with working

Solution:

6) 25÷14=25×41=85=135.

7)
4.5×2222+23=4.5×2245=2.2
4.5×2322+23=4.5×2345=2.3

8) y=108x=108×12=104=6
9) The easiest way is to assume the middle two numbers are 6, now the sum of the two them is 12, the sum of the rest must be 8×412=3212=20, we can satisfy it with 1, 19.

So the four numbers are 1, 6, 6, 19.

10) x=4×5+32=232=1112

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