Question

If $3s+5t=10$ and $2s-t=7$, calculate the value of $\frac{1}{2}s+3t$.

• A. $0$
• B. $1.5$
• C. $2.8$
• D. $3.4$
• E. $3.5$

Answer 1

The correct option is B $1.5$

Given $3s+5t=10$ and $2s-t=7$

By subtracting $2s-t=7$ from $3s+5t=10$, we get
$s+6t=3$

Dividing throughout by $2$,

$\Rightarrow \frac{s}{2}+3t=1.5$