C-05-Q074mediumsingle_mcq

The tens digit of a two-digit number is twice its units digit. If sum of digits is $S$ , the number is—

a $7S$
b $9S$
c $11S$
d $S$

ব্যাখ্যা

If the units digit is $u$ , the tens digit is $2u$ , so the number equals $10(2u)+u=21u$ while the digit sum is $S=3u$ . Thus the number $21u=7\times3u=7S$ .

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Equations in One Variable — সব প্রশ্ন দেখুন (170টি) →

The tens digit of a two-digit number is twice its units digit. If sum of digits is SSS, the number is—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

The tens digit of a two-digit number is twice its units digit. If sum of digits is SSS, the number is—

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

The tens digit of a two-digit number is twice its units digit. If sum of digits is $S$ , the number is—

The tens digit of a two-digit number is twice its units digit. If sum of digits is $S$ , the number is—