Direct and inverse proportionIB MYP Maths Extended: Mind map

Exam questions on Direct and inverse proportion

1. $y$ is directly proportional to $x$, and $y=18$ when $x=4$.
   Find the value of $x$ when $y=63$.2 marks
2. $p$ is inversely proportional to $q$, and $p=6$ when $q=5$.
   Find the value of $q$ when $p=4$.2 marks
3. A currency exchange in Doha gives USD $68.50$ for QAR $250$, at a fixed rate with no commission.
   Find how many USD are given for QAR $1800$.3 marks