Question 318755
The cost of rock={{{75*R}}}, where {{{R}}} is the number of tons of rock you buy.
The cost of trees={{{93*T}}}, when {{{T}}} is the number of trees you buy.
Total Cost={{{C=75R+93T}}}, you know you have to buy 30 tons of rock, so {{{R=30}}}.
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{{{C=75(30)+93T}}}
{{{C=2250+93T<=2500}}}
{{{93T<=250}}}
{{{T<=250/93}}}
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Since {{{250/93}}} is about {{{2.7}}}, then you can only buy 2 trees once you buy all of the rock.