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RSB [31]
1 year ago
7

A positive number under 1000 has exactly one odd digit and it is also a multiple of 5. how many such numbers are there?

Mathematics
1 answer:
sammy [17]1 year ago
3 0

Answer:

75

Step-by-step explanation:

Numbers that apply (Had to count each one and it was a pain)

5

10

25

30

45

50

65

70

85

90

100

120

140

160

180

205

210

225

230

245

250

265

270

285

290

300

320

340

360

380

405

410

425

430

445

450

465

470

485

490

500

520

540

560

580

605

610

625

630

645

650

665

670

685

690

700

720

740

760

780

805

810

825

830

845

850

865

870

885

890

900

920

940

960

980

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What is the solution of -6 + a = 22?<br> A 28<br> B. -28<br> 0<br> C. 16<br> D. -16
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Step-by-step explanation:

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3 years ago
A boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip against the current takes 2 1 2 h.
docker41 [41]

Answer:

A)63miles per hour.

B)27 miles per hour

Step-by-step explanation:

HERE IS THE COMPLETE QUESTION

boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip against the current takes 2 1 2 h. What is the boat's speed (in still water)??b) How fast does the current in the river flow?

Let the speed of boat in still water = V(boat)

speed of current=V(current)

To calculate speed of boat downstream, we add speed of boat in still water and speed of current. This can be expressed as

[V(boat) +V(current)]

It was stated that it takes 1hour for the

boat to travels between two points of 90 mi apart downstream.

To calculate speed of boat against current, we will substact speed of current from speed of boat in still water. This can be expressed as

[V(boat) - V(current)]

and it was stated that it takes 2 1/2 for return trip against the Current

But we know but Speed= distance/time

Then if we input the stated values we have

V(boat) + V(current)]= 90/1 ---------eqn(1)

V(boat) - V(current) = 90/2.5----------eqn(2)

Adding the equations we have

V(boat) + V(current) + [V(boat) - V(current)]= 90/2.5 + 90/1

V(boat) + V(current) + V(boat) - V(current)]=90+36

2V(boat)= 126

V(boat)=63miles per hour.

Hence, Therefore, the speed of boat in still water is 63 miles per hour.

?b) How fast does the current in the river flow?

the speed of the current in the river, we can be calculated if we input V(boat)=63miles per hour. Into eqn(1)

V(boat) + V(current)]= 90/1

63+V(current)=90

V(current)= 27 miles per hour

Hence,Therefore, the speed of current is 27 miles per hour.

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