exam Maths Puzzle Numerical Ability

A jar contains 5-gram bolts and 10-gram bolts. The contents of the jar weigh 2.35kg. If there are 300 bolts altogether, how many are there of each kind?

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question is from prentice hall mathematic algebra 2
y=x^2+3 the value for x is -3,-1,0,1.5,4 what would the equation be for the linear function of the speed of a car?