Calculating 9th grade

Solve arithmetic

100

Josh has $25.0 and Julia has $9.0. How much more does Josh have than Julia? 

$25.0-$9.0= $16

200

Jenny has $19.0 and Karen has $6.0. 

How much money do they have all together?

$19.0+$6.0=$25.0

300

Andrew walked 5 km per hour. He walked for 4 hours. How far did he walk?

5km * 4hrs=20km/hrs

400

Dave read 25 pages a day. He has read 150 pages. How many days did he read the book?

150: 25= 6 days

I think of a number

100

I think of a number. I add 25 and multiply by 3. My answer is 150. What was my number?

25

200

I think of a number. I subtract 5 and multiply by 6. then I divided by 3. My answer is 10.  What was my number?

10

300

I think of a number. I multiply by 2 and then subtract 12. My answer is 62. what was my number?

37

400

I think of a number. I divided by 4 and add 30. Then i subtract 5. My answer is 50. What was my number?

100