Answer:
Total coins are in his collection is 35 coins
Step-by-step explanation:
In his box = 7 coins
7 coins is 20% of the collection.
Total Coins :
7 ÷ 20%
[tex] \tt7 \div \frac{20}{100} [/tex]
[tex] \tt{7 \times \frac{100}{20} }[/tex]
[tex] \tt{7 \times 5}[/tex]
35 coins
Proof :
35 × 20%
35 × 1/5
35 ÷ 5
7