The Maths behind Problem Solving

Splashford Swimming Pool charges £2 per session for adults and £1 for children.

Also available is a Family Swimcard. At a cost of £50, the Family Swimcard allows unlimited use of the pool for one year for 2 adults and up to 3 children. For larger families, every additional child must pay half the children's rate each time.

Mr and Mrs Teal and their 4 children are keen swimmers. They used their Swimcard when the family went swimming 40 times last year.

2.    How much did the Swimcard save the Teal family last year?
A.   £50
B.   £190
C.    £230
D.   £250
E.    £270