exam Maths Puzzle Numerical Ability

y=(4-x)-1
this is is a square root

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exam Other Question

7(d-5)+1=5 What is d?? Write the fraction as a percent.
1 1/5 (One and one/fifth)

can someone please help me with this? I have never been good with these kind of problems and obviously nothing has changed. I just do not understand how to do this.