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Question Number 198684 by cortano12 last updated on 23/Oct/23

 ζ

ζ

Answered by Red1ight last updated on 23/Oct/23

24,88  A=24×88=2112  P=24+88=112  2112⇒112=P

24,88A=24×88=2112P=24+88=1122112112=P

Commented by mr W last updated on 23/Oct/23

how did you get these numbers?

howdidyougetthesenumbers?

Commented by Red1ight last updated on 23/Oct/23

by trial and error

bytrialanderror

Commented by mr W last updated on 23/Oct/23

thanks!

thanks!

Answered by Rasheed.Sindhi last updated on 23/Oct/23

Let a and b are 2-digit numbers  such that:  a+b+2000=ab  ab−a−b=2000  a(b−1)−b+1=2000+1  (b−1)(a−1)=2001  (b−1)(a−1)=3×23×29  (b−1)(a−1)=23×87=69×29  b−1=23 ∧ a−1=87  b=24 ∧ a=88   ✓  b−1=29 ∧ a−1=69  b=30 ∧ a=70 ✓

Letaandbare2digitnumberssuchthat:a+b+2000=ababab=2000a(b1)b+1=2000+1(b1)(a1)=2001(b1)(a1)=3×23×29(b1)(a1)=23×87=69×29b1=23a1=87b=24a=88b1=29a1=69b=30a=70

Commented by mr W last updated on 23/Oct/23

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Commented by Rasheed.Sindhi last updated on 23/Oct/23

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Commented by cortano12 last updated on 23/Oct/23

nice

nice

Answered by mr W last updated on 23/Oct/23

say the two 2−digit numbers are x, y.  xy=2pqr  x+y=pqr  xy−(x+y)=2000  x=((2000+y)/(y−1))≤99 ⇒y≥22, similarly x≥22  x=((2001)/(y−1))+1=((3×23×29)/(y−1))+1  y−1=23 ⇒y=24, x=88  y−1=29 ⇒y=30, x=70  (y−1=3×23=69 ⇒y=70, x=30)  (y−1=3×29=87 ⇒y=88, x=24)  so the two numbers are   24, 88 or 30, 70.

saythetwo2digitnumbersarex,y.xy=2pqrx+y=pqrxy(x+y)=2000x=2000+yy199y22,similarlyx22x=2001y1+1=3×23×29y1+1y1=23y=24,x=88y1=29y=30,x=70(y1=3×23=69y=70,x=30)(y1=3×29=87y=88,x=24)sothetwonumbersare24,88or30,70.

Commented by cortano12 last updated on 23/Oct/23

great

great

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