just put the words into symbols. If there are
b bicycles, and
b = u+120
t = 4u
b = t+75
Now you can just start substituting and watch the variables get resolved:
b = u+120
b = 4u+75
u+120 = 4u+75
3u = 45
t=4u = 60
So, they made
check that the numbers satisfy the original conditions. They do.
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