Answer:
C
Explanation:
let a be the number of adults and c the number of children.
Now set up a pair of simultaneous equations and solve for a
a + c = 160 → (1) [ based on 160 desserts being sold ]
6a + 3c = 816 → (2) [ based on cost of dessert for adult/ child ]
multiplying (1) by - 3 and adding to (2) will eliminate c
- 3a - 3c = - 480 → (3)
add (2) and (3) term by term to eliminate c
(6a - 3a) + (3c - 3c) = 816 - 480
3a + 0 = 336
3a = 336 ( divide both sides by 3 )
a = 112
That is 112 adults ordered desserts