Problema Solution
A certain bronze alloy containing 4% tin is to be added to 350 kg of bronze containing 18% tin to produce a new bronze containing 15% tin. How many kilograms of the 4% bronze are required.
Answer provided by our tutors
Let x = no. of kgs of 4% tin alloy
350 - x = no. of kgs of 18% tin alloy
.04(x) + 0.18(350 - x) = 0.15(350)
.04x + 63 - .18x = 52.5
0.04x - 0.18x = 52.5 - 63
-0.14x = -10.5
x = -10.5/(-0.14)
x = 75 kgs of 4% tin alloy
350 - 75 = 275 kgs of 18% tin allow