peter1104 peter1104

22-12-2016
Mathematics

Answered

The sum of two numbers is 87. if three times the smaller number is subtracted from the larger number the result is seven. find the two numbers

Verified Answer :

mathssydney mathssydney

22-12-2016

\(\left \{ {{a+b=87} \atop {a-3b=7}} \right.\)

a-3b=7
a=7+3b

a+b=87
(7+3b)+b=87
7+4b=87
4b=87-7
4b=80
b=20

a=7+3b
a=7+3*20
a=7+60
a=67

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