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ehidna [41]
3 years ago
12

The sum of two numbers is 62, and their difference is 12. What are the numbers?

Mathematics
2 answers:
nordsb [41]3 years ago
6 0
X+y=62 ; x-y=12 Solve for x in one equation and plug that value into the other equation. ===> x=12+y ; 12+y+y=62 Subtract 12 to both sides (2y=50), then divide by 2 to find y (y=25). Now, plug 25 as y into x=12+y, getting x=37. Your two numbers are 37 and 25.
Bas_tet [7]3 years ago
3 0

Answer:  The required numbers are 37 and 25.

Step-by-step explanation:  Given that the sum of two numbers is 62 and their difference is 12.

We are to find the numbers.

Let x and y represents he given numbers.

Then, according to the given information, we have

x+y=62~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)\\\\x-y=12~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(ii)

Adding equations (i) and (ii), we get

(x+y)+(x-y)=62+12\\\\\Rightarrow 2x=74\\\\\Rightarrow x=\dfrac{74}{2}\\\\\Rightarrow x=37.

And, from equation (i), we get

37+y=62\\\\\Rightarrow y=62-37\\\\\Rightarrow y=25.

Thus, the required numbers are 37 and 25.

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Answer:

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Question

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A boy is cycling such that the wheels of the cycle are making 140 revolutions per minute. If the diameter of the wheel is 60cm, calculate the speed per hour with which the boy is cycling.

Easy

Solution

verified

Verified by Toppr

Radius of the wheel =r=

2

60

=30 cm

Circumference of the wheel =2πr=2×

7

22

×30=

7

1320

cm

Distance covered in 1 revolution =

7

1320

cm

Distance covered in 140 revolutions =

7

1320

×140=26400 cm=264 m=

1000

264

km

Distance covered in one minute = Distance covered in 140 revolutions =

1000

264

km

Distance covered in 1 hour =

1000

264

×60=15.84 km

Hence, the speed with which the boy is cycling is 15.84km/hr.

3 0
2 years ago
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