book Maths Puzzle Numerical Ability

Kyle weighs twice as much as his younger sister Suzanne and 10 pounds less than his older sister Margaret. All together they weigh 90 pounds. How much does Margaret Weigh.

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book Other Question

64^x=4

please help if you do not mind. thank you very much explain how the graph of y=a*f(x) can be transformed from the graph of y-f(x). Explain in words how "a" affects the graph and show examples using specific values and when a<0, a>1