book Maths Puzzle Numerical Ability

solve for all unknown variables:
RmTm=RrTr ... these are what they give you... Rm=8, Rr=2, Tr=5-Tm

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book Other Question

graph (Show your work)
y=16-x^2
Thanks a bunch A firm has budgeted a $1500 for display space at a toy show. Two types of display booths are available: "preferred space" costs $18 per square foot unit, with a minimum rental of