WAEC - Mathematics (1989 - No. 17)
If twice a certain integer is subtracted from 5 times the integer, the result is 63. Find the integer.
21
9
7
4
3
설명
Let the integer = y
\(\therefore\) 5y - 2y = 63
3y = 63 \(\implies\) y = 21
Let the integer = y
\(\therefore\) 5y - 2y = 63
3y = 63 \(\implies\) y = 21