Question:

In a competition, three teams, A, B and C, scored a total of 150 points.
If A scored 40% of this total and B scored four times as many points as C, what were the number of points scored by B?

A 72

Explaination

Let a be the points earned by A, b be the points scored by B, and c be the points scored by C.
$8475_w82_h38.png$
$9266_w137_h45.png$
a=60points
b = 4c
150=a+b+c
150=60+4c+c
150=60+5c
5c=150–60
$4138_w52_h37.png$
c = 18 points
b=4c=$7975_w138_h17.png$