500 tickets were sold for a concert tickets for adults and children were sold at
MATHEMATICS
WAEC 2021
500 tickets were sold for a concert tickets for adults and children were sold at &4.50 and &3.00 respectively if the total receipts for the concerts was &1987.50 how many tickets for adults were sold?
- A. 325
- B. 235
- C. 175
- D. 400
Correct Answer: A. 325
Explanation
A for Adults
C for children
a + c = 500
c = 500 - a
4.5a + 3c = 1987.50
where c = 500 - a
4.5a + 3(500 - a) = 1987.50
4.5a - 3a = 1987.50 - 1500
1.5a = 487.5
a = 487.5 / 1.5
a = 325 tickets
c = 500 - a
c = 500 - 325
c = 175 tickets
Check:
from 4.5a + 3c
4.5 (325) = 1,462.5
+
3(175) = 525
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