In 2017 the number of teachers in a school was 20. The number of teachers doubles each year. If in 2019 3/5 of the teachers are female how many male teachers are there in 2019?


Firstly the number of teachers doubles every year, so how many teachers are there in 2019?2017 = 202018 = 20 x 2 = 402019 = 40 x 2 = 80If 3/5 of the teachers are female what fraction are male?1/1-3/5 = 2/5Explanation through either drawing a circle into segments or by actually subtracting fraction.So what is 2/5 of 160?2/5 x 80 = 160/5 = 32 male teachers.Explanation: of means multiply. Either cancel down fraction beforehand i.e. diagonally dividing 80 and 5 by 5 to get 16 x 2 = 32 OR as shown above simply multiply out 2x80=160, divided by 5 is 32.

Answered by Lorna P. Maths tutor

2257 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

What is rationalising a fraction?


The nth term of a sequence is 7n-4. Write down the 4th term and the 10th term of the sequence. The first four terms of a different sequence are 9, 13, 17, 21. Find an expression for the nth term of this sequence.


Factorising and Expanding brackets


I'm struggling with quadratic equations


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences