Question

If 3 girls can decorate 2 holiday cards in 1.5 minutes, how many holiday cards can 6 girls decorate in 1 hour if they work at the same speed?

Answer 1

Notice that 2*3=6.

On the other hand, according to the question, 3 girls can decorate a total of

`\begin{gathered} (60)/(1.5)=40 \\ \Rightarrow40\cdot2=80 \end{gathered}`

80 holiday cards in one hour. Therefore, 6 girls can decorate 2*80=160 holiday cards in the same amount of time.

The answer is 160 holiday cards per hour