exam Maths Puzzle Numerical Ability

x+7=11

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A Childs grandparents purchase a $16,000 bond that matures in 16 years to be used for her education. The bond pays 6% interest compound semiannually. How much will the bond be worth at maturity? It takes 175 seconds for Sarah to walk from her house to the store and back. Going there she walks at 3 ft/sec and on the way back at 4 ft/sec. How long did it take her to walk to the store?