If a trader had U.S dollars 3,600 and wanted to exchange it for GBP sterling, how many GBP did she get?

Tunatumia mbinu ya vigawo vikuu:

$$20 = 2^2 \times 5$$ $$30 = 2 \times 3 \times 5$$ $$40 = 2^3 \times 5$$

LCM inapatikana kwa kuchukua vigawo vikuu vyote vilivyopo na kuzidisha kwa nguvu zao za juu zaidi:

$$\text{LCM}(20, 30, 40) = 2^3 \times 3^1 \times 5^1 = 8 \times 3 \times 5 = 120$$

Hivyo, kengele zitapiga pamoja tena baada ya dakika 120.

Tunajua kuwa saa 1 ina dakika 60.

$$\text{Masaa} = \frac{120 \text{ dakika}}{60 \text{ dakika/saa}} = 2 \text{ masaa}$$

Kengele zilipiga pamoja saa 11:00 asubuhi.
Muda mpya = 11:00 asubuhi + masaa 2 = 1:00 mchana.

Kengele zitapiga pamoja tena saa 1:00 mchana.

$$\text{1:00 mchana}$$