A soil supplement that weighs 18 lb contains iron, potassium, and a mulch. There is fifteen times as much mulch as iron and twice as much potassium as iron. Find the amount of mulch in the soil supplement.
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Let the amount of iron be y.
Mulch = 15y; there is fifteen times as much mulch as iron.
Potassium = 2y, i.e. there is twice as much potassium as iron
Total = 18 lb
so y + 15y + 2y = 18
18y = 18 lb
y = 1 lb
thus 15y = 15lb
So the amount of mulch in the soil supplement is 15 lb
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