Question

7. Află numerele necunoscute:
x:15 = 17 rest 7
169: a = 24 rest 1
a : 7 = 143 rest 6
286 : b = 15 rest 1
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Answer 1

x : 15 = 17 rest 7

x = 17 × 15 + 7

x = 255 + 7

x = 262

169 : a = 24 rest 1

a = ( 169 - 1 ) : 24

a = 168 : 24

a = 7

a : 7 = 143 rest 6

a = 143 × 7 + 6

a = 1001 + 6

a = 1007

286 : b = 15 rest 1

b = ( 286 - 1 ) : 15

b = 285 : 15

b = 19

Answer 2

169:a=24 rest 1

a=(169-1):24

a=168:24

a=7

_________________

x:15=17 rest 7

x=17×15+7

x=255+7

x=262

__________________

a:7=143 rest 6

a=143×7+6

a=1001+6

a=1007

__________________

286:b=15 rest 1

b=(286-1):15

b= 285:15

b=19