Question

sum of two number is 90 day are in the ratio of 7:8 find the numbers​

Answer 1

Answer:

let the numbers be 7x and 8x.

7x+8x=90

15x=90

x=6

7x=7×6

=42

8x=8×6

=48

Answer 2

Answer:

42 and 48 respectively

Explanation:

Let the numbers be 7x and 8x repectively

Then,

=  7x+8x=90

=  15x=90                                            (Add 7x and 8x)

=  x=90/15                                           (Take 15 on the RHS)

=  x=6                                                 (Divide 90 by 15)

Therefore

=  7x                 =8x                                (Substitute x with 6)

= 7×6                 =8×6                              (Multiply)

= 42                   =48

Verification:

=  7x+8x=90                               (Substitute with 42 and 48 respectively)

=  42+48=90                               (Add them)

=  90=90        

=  LHS=RHS

                                               

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