1) x + 17 = 22 a) x = 5 b) x = 6 c) x = 4 d) x = 39 2) 100 - x = 67 a) x = 43 b) x = 33 c) x = 167 d) x = 32 3) x : 5 = 50 a) x = 100 b) x = 200 c) x = 500 d) x = 250 4) x • 9 = 99 a) x = 10 b) x = 9 c) x = 12 d) x = 11 5) x + (11 - 7) = 18 a) x = 14 b) x = 15 c) x = 22 d) x = 13 6) x - (26 + 15) = 100 a) x = 59 b) x = 58 c) x = 131 d) x = 141 7) 350 : x = 7 a) 5 b) 35 c) 10 d) 50 8) 5,4 + x = 10 a) x = 4,6 b) x = 5,6 c) x = 6,4 d) x = 15,4 9) 1/2 + x = 1 a) x = 1 b) x = 1/4 c) x = 1/2 d) x = 2/1 10) x • x = 9 a) x = 9 b) x = 6  c) x = 3 d) x = 4 11) x • 100 = 0,1 a) x = 0,0001 b) x = 0,001 c) x = 0,010 d) x = 0,00001 12) x + 1/2 = 1 a) x = 3/6 b) x = 1/4 c) x = 3/2 d) x = 1 13) x - 63 = 100 a) x = 163 b) x = 37 c) x = 36 d) x = 47 14) x : 8 = 40 a) 320 b) 360 c) 340 d) 300 15) 11 • x = 99 a) x = 9 b) x = 11 c) x = 88 d) x = 110 16) x + 170 = 310 a) x = 140 b) x = 130 c) x = 40 d) x = 240 17) 520 - x = 190 a) 330 b) 320 c) 710 d) 230 18) 360 : x = 6 a) x = 60 b) x = 6 c) x = 70 d) x = 50 19) x + 3/4 = 6/4 a) x = 3/4 b) x = 1/4 c) x = 6/4 d) x = 1/2 20) x - 2/5 = 3/5 a) x = 1 b) x = 3/5 c) x = 7/5 d) x = 1/2 21) x • 3/5 = 3/10 a) x = 1/2 b) x = 2/1 c) x = 1/3 d) x = 3/5

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