Basic Operations

Inside the parentheses, we have $240-15\times 9$.

Perform multiplication first: $15\times 9=135$.

Then perform subtraction: $240-135=105$.

So the expression becomes: $13\times (105)+7\times 120$

Perform the multiplications from left to right:

$13\times 105$:

$13\times 100=1300$

$13\times 5=65$

$1300+65=1365$

$7\times 120$:

$7\times 12=84$

$84\times 10=840$

So the expression becomes: $1365+840$

$1365+840=2205$

The final answer is $2205$.

$5\text{ rows}\times 18\text{ seats/row}=90\text{ VIP seats}$

$90\text{ seats}\times 125\text{ dollars/seat}=11,250\text{ dollars}$

Total rows: $25$

VIP rows: $5$

Regular rows: $25-5=20$

$20\text{ rows}\times 18\text{ seats/row}=360\text{ regular seats}$

$360\text{ seats}\times 80\text{ dollars/seat}=28,800\text{ dollars}$

$11,250\text{ (VIP revenue)}+28,800\text{ (regular revenue)}=40,050\text{ dollars}$

The total revenue from ticket sales is $$40,050$.

First parenthesis: $288÷12=24$

Second parenthesis: $35+145=180$

The expression becomes: $24\times 180-750$

$24\times 180$:

We can think of this as $24\times 18\times 10$.

$24\times 18=(20+4)\times 18=(20\times 18)+(4\times 18)=360+72=432$.

Now multiply by $10$: $432\times 10=4320$.

The expression becomes: $4320-750$

$4320-750=3570$

The final answer is $3570$.

The factory produces $150$ items/day for $6$ days.

$150\text{ items/day}\times 6\text{ days}=900\text{ items}$

$50+75+100+125+150+175$

$50+75=125$

$125+100=225$

$225+125=350$

$350+150=500$

$500+175=675\text{ items}$

Starting stock: $300$ items

Add production: $300+900=1200$ items

Subtract shipments: $1200-675=525$ items

At the end of the day on Saturday, there are $525$ items in stock.