book Maths Puzzle Numerical Ability

Two investments were made by totaling $8,800. For a certain year these investments yielded $1326 in simple interest. PArt of the $8,800 was invest at 4% and part at 16%. FInd the

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2.6 {{{ sqrt 750}}} Would someone please help me figure this out?
A boat traveled 36 miles downstream with the current, in 1.5 hours. The return trip upstream, against the current covered the same di