Question 1002693
Hi there,
13 Blue envelopes
..................
She has  3 fewer yellow envelopes 
than blue envelopes. 
= 10 Yellow Envelopes
..................
She has 7 times as many green 
envelopes as yellow envelopes. 
= 70 Green Envelopes
.................
Total 13 + 10 + 70
= 93 Envelopes in total.
Hope this helps :-)