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Solnce55 [7]
3 years ago
12

Can someone explain? Please help! 15 pts!!!!

Mathematics
1 answer:
anygoal [31]3 years ago
3 0
Let 
x--------------> the third stone measure

we know that
the recommended height for the bench is ------> 20 in
20=[4 3/8]+[4 1/2]+[5 1/4]+[x]
4 3/8---------> (4*8+3)/8=35/8
4 1/2---------> (4*2+1)/2=9/2
5 1/4---------> (5*4+1)/4=21/4

20=[35/8]+[9/2]+[21/4]+[x]

<span>x=20-(35/8)-(9/2)-(21/4)</span>

x=20-(35+4*9+2*21)/8-----> 20-113/8------- > (8*20-113)/8

x=47/8---------- > 5.875=5 7/8

<span>
<span>the answer is 5 7/8 in</span></span>



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