Question

please give me answers with step-by-step its urgent ​

Answer 1

a) 3/5 x 21 = 12.6

b) 28 x 4 = 112

c) 5+3x2/3 = 7

d) (x - 6) x 5 = 0

(6 -6)x 5 = 0

0 x 5 = 0

Answer 2

Step-by-step explanation:

a) let the number be A

Three fifth of the number is 21

=>(3/5)×A=21

=>A=21×(5/3)

=>A=(21×5)/3

=>A=7×5

=>A=35

The required number is 35

b)Let the number be B

Four times the number is 28

=>4×B=28

=>B=28/4

=>B=7

The required number is 7

c)Let the number be C

when you add 5 to three times the number you get 7

=>3×C+5=7

=>3C=7-5

=>3C=2

=>C=2/3

The required number is 2/3

d)let the number thought by Riya be D

Take away 6 from it=D-6

multiply the result with 5=5(D-6)

result is 0

=>5(D-6)=0

=>D-6=0/5

=>D-6=0

=>D=6

The required number is 6