Building

At the building, we divided 240 boards into two piles in a 5: 3 ratio. How many were fewer boards in the lower pile?

Result

x =  60

Solution:

x=240⋅ 55+3−240⋅ 35+3=60x = 240 \cdot \ \dfrac{ 5 }{ 5+3 } - 240 \cdot \ \dfrac{ 3 }{ 5+3 } = 60

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