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For the purpose of the equations, I’ll call Andre and Bob a and b respectively.
a – 20 = b + 20 (equation 1)
2(b – 22) = a + 22 (equation 2)
We can juggle those around for
a = b +40 (equation 1r (re-arranged)) and
2b – 44 = a + 22 so 2b – 66 = a (equation 2r (rearranged))
The equations are now:
a = b + 40 (new equation 1) and
a = 2b – 66 (new equation 2)
Substitute from new equation 1 to new equation 2:
b + 40 = 2b – 66 so 40 = b – 66 making b = 106.
Plug b = 106 into new equations 1 and 2 for:
a = 106 + 40 (new equation 1) and
a = 212 – 66 (new equation 2)
This gives a = 146 and b = 106
