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Adding the SolverFile  Options  Add-Ins  Solver Add-In

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What is solverAn Excel add-in that can be used to

an !opti"al# solution to a proble

based on so"e pre-deter"ined ob%e

solved b& changing a set o' decisvariables such that the solutions "e

given a set o' li"itations (constrai

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Ice +rea" Exa"ple, roble".escription

+onsider a proble" o' diet opti"i/ation* here are 'our di1erent t&pero3nies$ Ice +rea"$ +ola$ and +heeseca4e* he nutrition values andunit are as 'ollo3s,

 he ob%ective is to nd a "ini"u"-cost diet that contains at least 500at least 6 gra"s o' chocolate$ at least 70 gra"s o' sugar$ and at least'at*

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Step 7, .ecision 9ariables

STEP 1: Decision Variables

• o begin 3e enter a heading 'or each t&pe o' 'oo2,E2

• In the range :, E:$ 3e input trial values 'or the o' each 'ood eaten (An& values 3ill 3or4$ but at one should be positive)

For exa"ple$ here 3e indicate that 3e are consideeating three bro3nies$ no scoops o' ice crea"$ ono' cola$ and seven pieces o' cheeseca4e

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Step 2, Ob%ective FunctionSTEP 2: Objective Fnction

• o see i' the diet is opti"al$ 3e "ust deter"ine as 3ell as the calories chocolate$ sugar$ and 'at provides

• In the range ;, E;$ 3e re'erence the nu"ber o'

• In the range 8,E8$ 3e input the cost 'or each av'ood*

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Step 2, Ob%ective FunctionSTEP 2: Objective Fnction

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?@O.>+ (;,E;$ 8,E8) or = (;8) B (+;+8) B(E;E8)

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Step :, +onstraintsSTEP 3: !onstraints

• o begin$ 3e create a table in Excel that denes h

"an& calories and units o' chocolate$ sugar$ and in each t&pe o' dessert*

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Step :, +onstraintsSTEP 3: !onstraints

• Next$ 3e need to calculate the total a"ount o' ca

chocolate$ sugar C 'at - given the total nu"ber oite" (decision variables)*

• +reate a !otal# in +olu"n F

 =S>?@O.>+(DD;,DED;$7,E7)

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Step :, +onstraintsSTEP 3: !onstraints

• Finall&$ 3e need to indicate the li"itations highlig

the proble"*

•

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SOH9E ISte" 1: Set the Ob%ective

• Open Solver and clic4 on the to select the cellspreadsheet that calculates our ob%ective 'unctio70

• Next$ 3e "ust identi'& the t&pe o' proble" 3e arsolving - #$%

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SOH9E ISte" 2: Identi'& the decision variables

• +lic4 on the to select the cell in our spreadshetell solver 3hich variables it can change to reach opti"al solution*

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SOH9E ISte" 3: Add constraints

• On the right-hand side o' the 3indo3 there is a ba constraint

• >se the cell re'erence to input the totals 'or each3e calculated*

• +lic4 !Add# i' adding "ore than constraints or +lic

nished*

Exa"ple 'or +alories,

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SOH9E ISte" 3: Add constraints

•

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SOH9E I

Ste" 4: ?inor changes to Solverara"eters

• +hec4 the box #a)e *nconstraine'Variables %on+%e(ative (3e do not

3ant an& negative values)• +hange the Solvin( #etho' to

SI?HEL H

• +lic4 SO,VE

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Solution