Question

Suma a doua nr. 420 iar unul de doua ori mai mare decat celalant.Afla nr.

Answer 1

a+b =420
a= b×2
2b+ b = 420
b= 140
a= 280

Answer 2

$I \: \: \: \: \: \: \: \: /-----/ \\ \\ II \: \: \: /-----/-----/ \: \\ \\ \: \it 3~parti~egale \\ \it 420:3 = 140 \: (primul~numar) \\ \it 140 \cdot 2 = 280 \: (al~doilea~numar) \\ \\ \it a + 2a = 420 = = > 3a = 420 = = > a = \frac{420}{3} = = > a = 140 \\ \it 2a = 2 \cdot 140 = = > a = 280$