book Maths Puzzle Numerical Ability

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-2/3(6/5-7/10)=17/20

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book Other Question

Write the first four terms of the sequence an=64(1/4)^n, for n=0, 1, 2, 3,
How do I finish problem? i would like help with these problems. - {{{2-3/4Z=1/8z+9}}} and the story problem - five times the sum of a number and 3 is the same as 3 multipled by 1 less than twice the number