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7.cost of 5pens and 10 pencils is 105
let pen be x and pencil be y
x=5y
let us from an equation
5x+10y=105
5(5y)+10y=105
25y+10y=105
35y=105
y=3
we know x is 5y
=5*3=15
cost of pen is 15 and cost of pencil is 3
pls mark as brainliest
let pen be x and pencil be y
x=5y
let us from an equation
5x+10y=105
5(5y)+10y=105
25y+10y=105
35y=105
y=3
we know x is 5y
=5*3=15
cost of pen is 15 and cost of pencil is 3
pls mark as brainliest
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