Write an expression for the calculation triple 3 and then add double 8

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction