Question

b 15 26 77 208 319
bx15
b+15

Answer 1

15+15=30 15×15=225

26+15=41 26×15=390
77+15=92 77×15=1155
208+15=223 208×15=3120
319+15=334 319×15=4785

Answer 2

Daca : 

B - 15 

B ×  15 = ?

15 × 15 = 225

B + 15 = ?

15 + 15 = 30 

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 B = 26

B × 15 = ?

26 ×  15 = 390

B + 15 = ?

26  + 15 = 41


____________________________________

B = 77 

B × 15 = ?

77 × 15 = 1155

B + 15 = ?

77 + 15 = 92 

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B = 208

B × 15 = ?

208 × 15 = 3120 

B + 15 = ?

208 + 15 = 223

______________________

B = 319

B × 15 = ?

319 × 15 = 4785 

B + 15 = ?

319 + 15 = 334

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