Mary spent hour waiting for the school bus and to hour riding the bus to school. How much time did Mary spend in all?

Question

asked Aug 11, 2023 216k views

1 Answer

Exos · Answer 1 · 2023-08-17T02:27:47+0000

7/10

1) Since May spent:

2/5 hour waiting

3/10 hour riding

2) We'll have to add them up. Since these fractions have different denominators (bottom number) let's calculate the LCM of 5 and 10:

So dividing them by prime numbers, the LCM is the product of 2 and 5 = 10.

So we can write:

$(2)/(5)+(3)/(10)=(10\colon5*2+10\colon10*3)/(10)=(4+3)/(10)=(7)/(10)$

3) Hence, Mary spent 7/10 of an hour in all.