Explanation

Explanation

Convert feet to inches and simplify 8/84​=2:21.

Explanation

The sum of the ratio parts is 4 + 6 = 10.

Explanation

Explanation

75+80+85+x​/4​=80⇒x=80.

Explanation

Pipe A and pipe B can fill the tank in 3 hours and 5 hours, then total work = LCM of (3, 5) = 15 unit

Efficiency of pipe A = 15/3 = 5 unit and efficiency of pipe B = 15/5 = 3 unit

From 7 to 8 AM, pipe A alone done 5 unit, work remains (15 - 5) = 10 unit,

Now, pipe A and B together can do it in = 10/(5 + 3) = 10/8 hours = 10/8 × 60 = 75 min

 The required time is 8 AM + 75 min = 9 AM + 15 min = 9 : 15 AM

∴ The correct answer is 9 : 15 AM

Explanation

Let's calculate the total cost of placing an advertisement containing 22 words:

Fixed cost = $3.50

Variable cost = 22 words x $0.25 per word = $5.50

Total cost = Fixed cost + Variable cost = $3.50 + $5.50 = $9.00

So, the total cost of placing an advertisement containing 22 words is $9.00.

Explanation

To calculate speed in km/h:

1. Convert the time to hours:
   $20\text{ minutes}=\frac{20}{60}\text{ hours}=\frac{1}{3}\text{ hours}$

2. Use the formula for speed:
   $text{Speed} = frac{text{Distance}}{text{Time}} = frac{16}{frac{1}{3}} = 16 times 3 = 48 , text{km/h}$
   

So, the speed of the train is 48 km/h.

Explanation

7*70 = 490 kg - total weight of 7 people

80 - 60 = 20 kg less

(490 -20)/7 ≈ 67.14 kg - new average weight ANSWER

Explanation

Let the first number be = 6xSecond number = 3xand the third number = 2xAccording to the question 6x + 3x + 2x = 154 × 3or 11x = 154 × 3Required difference = 6x – 2x = 4x = 4 × 42 = 168