exam Maths Puzzle Numerical Ability

can you help me solve this system using the elimination method?
s + p + c = 40
c = 4p
s = p - 2

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exam Other Question

i need help and i don't understand A reduced fat cookie contains 4 grams of fat per serving. In order for food to be termed "reduced fat", it must have at least 15% less fat than the regular item. What can you conclude about how much fat is in a serving of the regular cookie?