Answer:
![(1)/(20)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5f9v25atoyys0ks3tbf3hl4fxhgeu8d9hs.png)
Explanation:
We have been given that Diego eats 1/5 of a loaf of bread each day. On Tuesday, Diego eats 1/4 of the day’s portion before lunch.
To find the fraction of the whole loaf eaten by Diego before lunch on Tuesday, we will find 1/4 of 1/5 as:
![\text{Fraction of the whole loaf eaten by Diego}=(1)/(5)* (1)/(4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/hhlzh6s2cj3wfquvy0pp5lfve1uetiz5sa.png)
![\text{Fraction of the whole loaf eaten by Diego}=(1*1)/(5*4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/xatv8mena8ig03124aemdk5ab46pd3fw21.png)
![\text{Fraction of the whole loaf eaten by Diego}=(1)/(20)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/syap6f8ryfzumq9r3gyzqyz2pdzkpk066k.png)
Therefore, Diego has eaten
of the whole loaf before lunch on Tuesday.