Explanation (very simple steps)
- What does g mean?
It stands for the number of girls enrolled last year.
( ext{Last year} = g)
- Three times last year
Multiply (g) by 3:
(3 imes g)
(= 3g)
- Ten less than that
Now subtract 10 from (3g):
(3g - 10)
- Meaning in words
( ext{This year} = 3g - 10) means:
“The number of girls this year is 10 less than three times the number last year.”
Quick check with an example
- Suppose (g = 20) (last year 20 girls).
- Three times last year: (3 imes 20 = 60).
- Ten less than that: (60 - 10 = 50).
- So, this year would be 50 girls — which matches the rule “10 less than 3 times last year.”