Jo's collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 2 and the ratio of Indian to British stamps is 5 to 1,what is the ratio of US to British stamps?

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font-family: Arial, sans-serif;

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display: flex;
align-items: center;
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z-index: 1000;

}
.logo {
font-size: 10px; /* আগের আকারে ফিরিয়ে আনা হয়েছে */
text-decoration: none;
color: white;
display: flex;
align-items: center;
}
.logo img {
width: 50px;
height: 50px;
margin-right: 15px; /* ইমেজ এবং লেখার মধ্যে স্পেস */
}
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margin-left: 10px; /* টেক্সটের সামনে স্পেস */
}
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display: none; /* Hidden by default */
flex-direction: column;
position: absolute;
top: 60px;
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background-color: black;
border: 1px solid #ddd;
padding: 10px;
width: 250px; /* Adjusted width for better visibility */
max-height: 80vh; /* Prevent the menu from becoming too tall */
overflow: auto; /* Allows scrolling if content exceeds max-height */
}
.menu a {
display: flex;
align-items: center;
padding: 10px;
text-decoration: none;
color: white;
font-size: 16px; /* Adjusted font size */
white-space: nowrap; /* Keeps text in a single line */
}
.menu a img {
width: 30px; /* Adjust icon size in the menu */
height: 30px;
margin-right: 10px;
}
.menu a:hover {
background-color: #333;
}
.menu-button {
cursor: pointer;
font-size: 24px;
border: none;
background: none;
color: white;
}
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outline: none;
}

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@media (min-width: 600px) {
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position: static;
flex-direction: row;
border: none;
padding: 0;
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}
.menu-button {
display: none; /* Hide the menu button */
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.menu a {
padding: 10px 15px;
font-size: 16px; /* Adjusted font size */
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@media (max-width: 600px) {
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.header {
flex-wrap: wrap;
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}

.header div {
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color: white;
font-size: 10px; /* আগের আকারে ফিরিয়ে আনা হয়েছে */
flex: 1;
min-width: 60px; /* আইকনগুলোর মধ্যে কমপক্ষে 60px জায়গা */
}
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height: 20px;
display: block;
margin: 0 auto;
}
.header a {
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text-decoration: none;
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@media (max-width: 600px) {
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