exam Maths Puzzle Numerical Ability

A 60 mililiter solution has 50% acid. How much pure water is needed to get 30% acid?

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exam Other Question

Find the multiplicative inverse of 2.25. (a) x+1/2=x+2/3
(b) 2x+3/x=2/3
(c) 3/x=2/1-x
(d) 2-x/3=2x-1/5
(e) 2x-3/4=2/3x
(f) x-1/2=2-x/3
(g) 1-k/3=k+2/2
(h) 2a-3/4=3-a/3
(i) 3/4=t/t+2
(j) 3/4=t/t+2