book Maths Puzzle Numerical Ability

x/5
_______
7/ x+5

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book Other Question

a=b+3(4-c) if b equals 5 and c equals 2, what is the value of a? please show me the work so i can understand how to do it myself Please help me I need this by Monday, please!! :0)

An investment of $1500 paid interest of $45 during a certain period. How much interest would an investment of $2000 invested at the same rate for the same length of time pay?