exam Maths Puzzle Numerical Ability

3 1/4y - 7 1/2 = 2 2/3

7/x - 2 = 4/x + 3

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i am not sure if you can help me with this problem but i will try to explain it..it was given to us in class. thanks for any help..

the question is
evaluate using logs

^3 sq A fish is 75 cm long.The head is as long as the tail.If the head were twice as long and the tail were its present length,the body would be 45 cm long.How long is each portion of the fish?