exam Maths Puzzle Numerical Ability

7.8+78+0.78

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exam Other Question

following equation defines a relation (x,y). Write the domain and range of each relation.
x^2/9 + y^2/16 = 1
Linda can stuff 1000 envelopes in 6 hours. If Laura helps her, they can both stuff 1000 envelopes in 5 1/2 hours. How long would it take Laura to stuff 12000 envelopes by herself?

Please solve in algebra Tx!!