book Maths Puzzle Numerical Ability

what is the LCD of 11(v-7) and 77(v-7)

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Find a6 for an=8(1/2)^n, n=1,2,3,4,... I have no idea how to do this problem. Please help me. the problem i got was a word problem asking basically if $28,500 was 25% greater than an amount, then what was that original amount, so I set it up as, {{{x+.25x=28,500}}}, so I di