SciMath Quiz Bee Difficult Round

What number is originally called as cipher?

The symbol for infinity (∞) was used by the Romans to represent what number?

Three guavas and two apples cost Php155, while five guavas and four apples cost Php285. What is the cost of each guava?

If you are going to face two mirrors to each other, how many image/s can you see?

Which of these inclined planes would be most efficient to use to move an object upward?

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A teacher applies a force of 50N to move a students bag 10m. How much work is done?