book Maths Puzzle Numerical Ability

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

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book Other Question

I cannot figure out how to start this equation

3(x+4 -1) =15 The (x+4-1)is divided by 2
2 If a rectangle is 108 square feet and the height is 9cm.What is the measure of the base?