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subtraction
addition
division
multiplication
100

3A - 2 = 15

a = 5 2/3

100

-5 + 11B = 10

b = 1 4/11

100

5k + 20 = 50

k = 6

100

5p + 60 = 50

p = -2

200

50D - 60 = 12

d = 1 6/25

200

c/40 + 6 = 95

c = 3560

200

11L/11 = 55

L = 55

200

108q / 20 = 30

q = 5 5/9

300

4 x 1e = 7

e = 3

300

2h x 10 = 30

h = 10

300

5m x 60 = 50

m = -2

300

200r - 3000 = 100

r = 15 1/2

400

f/8 + 9 = 13

f = 32

400

5i + 10 = 20

i = 2

400

61+ 50n = 500

n = 8 39/50

400

50s + 60 = 80

s = 0.4

500

14g - 16 = 17

g = 2 5/14

500

2j + 3 = 4

J = 0.5

500

55 - 65u = 600

u = 8 5/13

500

2t + 5 = 7

t = 1