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How do you work out the problem 72 divided by 2 plus a equals 40?
Wiki User
∙ 12y ago
72/2 + a = 40
multiply both sides by 2
2(72/2 + a) = (40)2
72 + 2a = 80
subtract 72 from each side
72 - 72 + 2a = 80 - 72
2a = 8
divide both sides integers by 2
(2/2)a = 8/2
a = 4
------------check in original equation
72/2 + (4) = 40
36 + 4 = 40
40 = 40
----------------checks
------------------------------------------------------------------------if you meant
72/(2 + a) = 40
multiply through by 2 + a
72 = 80 + 40a
subtract 80 from each side
- 8 = 40a
divide each side by 40
- 8/40 = a
- 1/5 = a
----------------------check in original equation
72/(2 + [- 1/5]) = 40
now 2 is 10/5
72/(10/5 + [- 1/5]) = 40
72/(9/5) = 40
72/(9/5) is the same as 72 * 5/9
360/9 = 40
40 = 40
-------------------------------checks either way
Wiki User
∙ 12y ago
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