exam Maths Puzzle Numerical Ability

x-1/x+2 = 2x-3/x+4

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The ratio of the number of red beads to blue beads in a box was 3:1. 3 more red and 4 more beads were added and the ratio became 2:1. How many red beads were there at first? The pages of a book are numbered from 1 to 128. How many page numbers contain the digit 6?