C-11-Q162mediumsingle_mcq

Ratio of absent to present students is $1:4$ . If $5$ originally absent students had been present, the ratio would have become $1:9$ . Total students in the class is—

a $30$
b $40$
c $50$
d $60$

ব্যাখ্যা

Let absent $=x$ and present $=4x$ , so total $=5x$ . Moving $5$ absent students gives $(x-5):(4x+5)=1:9$ , which solves to $9(x-5)=4x+5$ , hence $x=10$ and total $=5x=50$ .

এই অধ্যায়ের আরও প্রশ্ন

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Algebraic Ratio and Proportion — সব প্রশ্ন দেখুন (180টি) →

Ratio of absent to present students is $1:4$ . If $5$ originally absent students had been present, the ratio would have become $1:9$ . Total students in the class is—

30

40

50

60

ব্যাখ্যা

Let absent $=x$ and present $=4x$ , so total $=5x$ . Moving $5$ absent students gives $(x-5):(4x+5)=1:9$ , which solves to $9(x-5)=4x+5$ , hence $x=10$ and total $=5x=50$ .

Ratio of absent to present students is 1:41:41:4. If 555 originally absent students had been present, the ratio would have become 1:91:91:9. Total students in the class is—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

Ratio of absent to present students is 1:41:41:4. If 555 originally absent students had been present, the ratio would have become 1:91:91:9. Total students in the class is—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

Ratio of absent to present students is $1:4$ . If $5$ originally absent students had been present, the ratio would have become $1:9$ . Total students in the class is—

Ratio of absent to present students is $1:4$ . If $5$ originally absent students had been present, the ratio would have become $1:9$ . Total students in the class is—