MooMooooMooM

The ratio 2:5 is the same as 4:10

So 87 is 3 parts in this ratio since 10-7 is 3.

One part would be 29.

Since there are 3 more parts of foreign stamps than local, 29*3=87 more foreign.

70+40=110 students with either condition

110-20 (because there are 20 repeats)=90 teachers with a condition

120-90=30 without conditions 

30/120=25%

2103, 2104, 2105, 2106, 2107, 2108, 2109

Since we can't have any numbers in the 2020-2029, section, 2030 is next. We can't have anything below or equal to 2033 because it would eventually run into 2033. But with 2034, there is just not enough space to finish. Same for the next. The 2090s would be 2093, 2094, 2095, 2096, 2097, 2098, and 2099.

So we go into the next century. We cant have 1 or 2 so 2103 and on will work.

Nope

5 - 5+10 does not equal 15

6 - 6+12 does not equal 16

anything in between - 6+ either 10 or 11 (doesnt matter does not equal 16)

235

236

253

263

255

266

265

256

Since there is also only 1 3 there are also 8 numbers that start at 3.

So we have 16 so far

For 6 we have

623

632

625

652

635

653

655

626

662

636

663

665

656

Then for 5 we have

523 

532

525

552

535

553

565

556

566

526

536

563

562

555

So I think that's it, 16+ the 6 column+ the 5 column

EFC is an isosceles triangle. So AF + EF will equal one of the larger sides of the biggest triangle. Since it is a parallelogram, the same holds true for AD+DE. So AC is 25 and 25+25=50.

3*16=48

48/8=6

x=6

148-120=28

3-2=1

7-6=1

So one jujube and one smartie costs 28 cents

Plugging that in our first equation - 2j+6s=120

Now we have 4s+28+28=120

Solving for s we get s=16

So a smartie costs 16 cents and jujube costs 12 cents.

40/1.32= 30.3030... euros paid

30.3030...-17=13.0303...

17.03 euros.

To get from 5 to 3 you subtract 2. 

To get from 5 to 1 you subtract 4. 

So what you do to the x value you double that to the y value.

To get from 5 to six you add 1.

1*2 is 2, 2+5=7