Mandy has 50 toy cars. 20% of the cars are silver. How many cars are silver?

When you arrive at the lake, your friend realises he hasn’t got any swimming trunks. you need to ride to a sports shop. the sports shop is 8350 metres away. how many metres is it to cycle there and back?

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry