exam Maths Puzzle Numerical Ability

how many grams are in 1.6 kilograms

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exam Other Question

A dentist invested a portion of $15,000 in a 7% annual simple interest account and the remainder in a 6.5% annual simple interest government bond. The two investments earn $1020 in interest annually. How much was invested in each account? I know how to do these I really just need to be refreshed the question I am having trouble with is .5n(n+1)to the second power