WAEC - Mathematics (2007 - No. 26)
I am x years old and my brother is 3 years older. How old was my brother last year?
(x - 4)years
(x + 2) years
(3x - 10years
(3x + 1)years
説明
I am x years old; My brother = 3 + x; My brother
last year = (3 + x) - 1 = x + 3 - 1
= (x + 2) years
last year = (3 + x) - 1 = x + 3 - 1
= (x + 2) years