## Problem Solving

 1.9 Problem Solving

 EXAMPLE 1: Mashitah has RM 4 530 in savings. His father distributed RM 150 equally to Mashitah and his 2 younger siblings. How much money does Mashitah have now? SOLUTION: Mashitah's savings: RM 4 530 Money given by Mashitah's father: RM 150 divide 3 Mashitah's total money: RM $$\Box$$ Mathematic Equation:  $$4\,530+(150\div3)=\Box$$ Solve the division first. $$150\div3=50$$ Substitute into the equation and solve. $$4\,530+(50)=4\,580$$ Therefore, Mashitah's total money is RM 4 580.

 EXAMPLE 2: A cement company has sent 4 trucks full of cement packages to a construction site. Each truck carries 45 packages of cement. On the way, 8 cement packages were torn. How many packages of cement are still good? SOLUTION: Number of trucks: 4 trucks Number of cement packages in 1 truck: 45 packages Number of torn packages: 8 packages Number of good packages = $$\Box$$ packages Mathematic Equation:  $$4\times45-8=\Box$$ Solve the multiplication first. $$\begin{array}{lr} &45\\ \times&4\\ \hline&180\\ \hline \end{array}$$ Substitute into the equation and solve. $$180-8=172$$ Therefore, 172 packages are still good.