1MA0 Foundation June 2014 Paper 1 Q10

EdexcelFoundationOld spec7 marksSolving Simple EquationsSubstitution

10 You can use these rules to change temperatures from \(^\circ\)C to \(^\circ\)F.

approximate rule
Multiply the \(^\circ\)C temperature by 2 and then add 30
exact rule
Multiply the \(^\circ\)C temperature by 1.8 and then add 32

Amy uses the approximate rule to change 20\(^\circ\)C to \(^\circ\)F.
Dan uses the exact rule to change 20\(^\circ\)C to \(^\circ\)F.

(a) Work out the difference between Amy’s result and Dan’s result. (4)

Jade uses the approximate rule to change a temperature from \(^\circ\)C to \(^\circ\)F.
The result is 110\(^\circ\)F.

(b) What \(^\circ\)C temperature did Jade change to \(^\circ\)F? (3)
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