exam Maths Puzzle Numerical Ability

if john bought a calling card and used 20 min and now its worth $4.00 and then used it again and used 46 min. altogether with only $2.96 of call time left.

a. for this calling c

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exam Other Question

solve for u:
mu=q
solve

(t+2)^3(t^2+2t+1)(t+1) over (t+1)(t^2+4t+4)(t+2)

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