Question

Miguel and Danny have $129 altogether. Danny has $27 less than Miguel. How much money does Miguel have?

Answer 1

M + M-27 = 129
now solve as usual.

Answer 2

answer: 78

I used basic algebra to solve:

let m = miguel's amount
m - 27 represents danny's amount, because he has 27 less than miguel
129 is the total amount, so miguel's amount plus danny's amount is a sum of 129

129 = m + (m - 27)

I plugged in miguel's and danny's amounts into the above equation, below I solve:
129 + 27 = 2m
156 = 2m
m = 78
miguel's amount is 78