book Maths Puzzle Numerical Ability

if you have a triangle the smallest side = 3cm and the longest side =10cm was does x =

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Hi, The question is a Farmer has Pigs & Chickens on his farm of which the sum of all the pigs & chickens legs equals 101. How many Pigs and how many chickens are on his farm. how would you solve a problem such as -7a=-12a-65? i dont understand this

josh