Question

find the value of a and b BA×B3=​

Answer 1

Answer:

 Basics of Decimals

In the product BA × B3 = 57...

MATHS

Asked on December 26, 2019 byHarmanjot Gore

In the product BA×B3=57A, what are the respective positional values of B and A?

A

6, 7

B

5, 2

C

7, 4

D

2, 5

HARD

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ANSWER

BA×B3=57A

as B is in 10′s place 

⇒(10×B+A)×(10B+3)=(57×10)+A

⇒100B2+10(A×B)+30B+3A=570+A

⇒100B2+10(A×B)+30B+2A=570 

⇒2A=570−100B2−10(A×B)−30B

⇒10/2A as 10 divides RHS 

⇒A=5

or A=0

for A=0, 100B2+30B=570

⇒10B2+3B=50+7

no B satisfies this as 

3B=7

for A=5,100B2+80B+10=