12,909 rounded to the nearest ten is 12,910
Let x=large boxes and y=small boxes.
x+y=110
60x+35y=5100
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You need to cancel out one of the variables to solve for one. Let's cancel out y.
-35(x+y=110)
-35x-35y=-3850
60x+35y=5100
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Add the two equations.
25x=1250
x=50
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Plug in 50 for x into one of the equations to solve for y.
50+y=110
y=60
_____________
50 large boxes
60 small boxes
3:7 =
3/7
3/7 = x/35
7x = 105
x = 15
answer : clara borrowed 15 books
She can make 3 batches. 3 batches will take 3 3/4 cups. If she made 4 it would take 5 cups
