Question 1044872
Rizwan gave 2/7 of the fruit trifle to his friend
That means there was {{{ 7/7 - 2/7 = 5/7 }}}
of the fruit trifle left
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(a)
Rizwan ate {{{ (1/5)*(5/7) = 1/7 }}} of what 
he started with
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(b)
So far, {{{ 2/7 + 1/7 = 3/7 }}} is gone.
There is {{{ 7/7 - 3/7 = 4/7 }}} of
the fruit trifle remaining