The snack bar at the park sells an average of 1.2×10^5 drinks per year and it sells an average of 4.0×10^4 hot dogs per year.
1 answer:
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ANSWER
The solution is
EXPLANATION
We want to solve the simultaneous equations
and
.
We substitute equation (2) in to equation (1), to obtain
This has now become a linear equation in a single variable .
We solve for x by grouping like terms.
We divide through by negative 3 to get;
.
Hence, the solution is
Answer:
The sum of ages of all 18 pupils in the class = 81
Step-by-step explanation:
Total number of pupil in the class = 18
Average of years in the class =
Now,
⇒Average of sum of ages in the class = 4.05
Let us assume the sum of ages of all students in the class = m
By the formula for AVERAGE:
or, m = 18 x 4.5 = 81
Hence, the sum of ages of all 18 pupils in the class = 81