exam Maths Puzzle Numerical Ability

how many ways can a dollar be used for ninety cents using quarters nickels and dimes?

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exam Other Question

lnes a and b are perpendicular. The slope of line a is given. What is the slope of line b?

2/5 If you bought 850 Douglas firs and ponderosa pines and paid an average of $300 for douglas firs and $225 for ponderosa pines and the total you spent was $217,500 how many of each tree did you buy?