Forming equations from contextIB MYP Maths Extended: Mind map

Exam questions on Forming equations from context

1. A mobile phone plan in Singapore costs a fixed charge of 12 Singapore dollars (SGD) per month plus SGD 0.05 for each minute of calls. The monthly bill is $C$ dollars when $m$ minutes of calls are made.
   Maria wants her monthly bill to be at most SGD 20. Form and solve an inequality to find the greatest number of minutes of calls she can make.2 marks
2. A rectangle has length $(2x+3)$ cm and width $(x-1)$ cm. Its perimeter is 46 cm.
   Hence find the area of the rectangle.2 marks
3. A school is hiring a coach for a trip. Company A charges AED 360 plus AED 12 for each student. Company B charges AED 20 for each student and has no fixed charge.
   Form and solve an equation to find the number of students, $s$, for which both companies charge the same amount.3 marks