A truck covers a distance of 16 km in 30 minutes. How much distance can it cover in 5 hours while
travelling at the same speed?

260 km for 300 mins

Step-by-step explanation:

16 km in 30 mins (half an hour)

There are 300 minutes in 5 hours

16 km for 30 mins

32 km for 60 mins

48 km for 90 mins

64 km for 120 mins

80 km for 150 mins

96 km for 180 mins

112 km for 210 mins

128 km for 240 mins

144 km for 270 mins

160 km for 300 mins

( all you need to do is keep on adding 16 km and 30 mins until you get to 5 hours/300 mins)  

So the truck covers a distance of 260 km for 300 mins

Hope this helped!

Have a day!

step-by-step explanation:

30% of $420 is 0.30($420) = $126 and $420 + $126 = $546.

or, 130% of $420 is 1.3($420) = $546.

notice that this is not the $600 original list price with which we started.

why doesn't this work?

the method does not work because 30% of $420 is not the same amount as the 30% of $600. it may seem obvious when stated this way, but it is a very common error made on problems of this type. we cannot just use the same percent and get back to the original amount because we are taking that percent of a different value.

to work problems of this type correctly, it is generally best to write an equation for the situation and then solve.

example: since (100% – 30%)(original price) = (sale price)

70% of the   (original price) is $420.

0.7x   = 420

equation image indicator

x = 600

the original cost was $600.

we may also solve this problem using the two-step method. working the problem in two steps requires us to use more algebra skills. we have to know that x = 1x (identity property of multiplicationtext annotation indicator) and that 1x – 0.3x = 0.7x (subtracting like terms). then we solve the problem as follows:

(original price) – 30%(original price) = sale price

x – 0.3x = 420

0.7x = $420

equation image indicator

x = 600

the original cost was $600.  

note that with both of the above methods we do obtain the correct original amount.

example: after a 5% pay raise, hermione is earning $22,680 per year. what was she earning before the pay raise?

105% of (original salary) = current salary

1.05x = 22,680

equation image indicator

x = 21,600

hermione earned $21,600 per year before the pay raise.

this is an example so maybe you will get how to at least do it!

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answer: d.) the total number of protons and neutrons is 15

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