Ahmad, Ben and Charlie had 189 pencils altogether. After Ahmad gave 3/10 of his pencils to Ben and another 1/4 of his pencils to Charlie, all 3 boys have the same number of pencils.

a) Who had more pencils at first? Ben or Charlie?

b) How many pencils did Ahmad have at first?

Harry wants to buy pencils and erasers. each pencil costs 30cenfs and each eraser costs 15cents. He wants to buy 30 items altogether with $5.25. How many pencils should be purchase if he wants to buy the most possible number of pencils?

Write down an expression for the cost, in dollars, if 30 pencils at x cents each and 16 pencils at y cents each

Use a calculator, paper and pencil, or mental math. Solve the equation.