There are 72 green and grey pens in Box E. There are 51 green and white pens in Box F. The number of grey pens in Box E is four times the number of white pens in Box F. The number of green pens in both boxes is the same.
- How many white pens are there in Box F?
- Find the total number of green pens in both boxes.
(a)
Number of grey pens = 4 u
Number of white pens = 1 u
Green pens + 4 u = 72 --- (1)
Green pens + 1 u = 51 --- (2)
(1) - (2)
4 u - 1 u = 72 - 51
3 u = 21
1 u = 21 ÷ 3 = 7
Number of white pens
= 1 u
= 7
(b)
Number of green pens in Box F
= 51 - 7
= 44
Number of green pens in both boxes
= 2 x 44
= 88
Answer(s): (a) 7; (b) 88