Question

(a) Find the difference between 3y minutes and
25y seconds, giving your answer in seconds.
(b) Find the sum of 50(3z- 2) minutes and
4(z+ 1) hours, giving your answer in seconds.

Answer 1

$a) Difference \: between \:3y\: minutes \:and \\25y \:seconds = 3y \: minutes - 2y \: seconds\\= 3y \times 60 \:seconds - 2y \:seconds$

$\boxed { \pink { Since , 1 \: minute = 60\:seconds }}$

$= 180y \:seconds - 2y \:seconds \\= 178y \:seconds$

$b) Sum \:of \:50(3z-2) \: minutes \:and \: 4(z+1) \\hours \\= 50(3z-2) \: minutes + 4(z+1) \:hours \\= 50(3z-2)\: times 60\:seconds + 4(z+1) \times 60 \: minutes \\= 50(3z-2)\: times 60\:seconds + 4(z+1) \times 60 \times 60\: seconds \\= 60[50(3z-2)+240(z+1)] \: seconds \\= 60[ 150z - 100 + 240z + 240]\:seconds \\= 60[(240-150)z + 240-100] \:seconds \\= 60(90z+140)\:seconds$

Therefore.,

$\red {a )Difference \: between \:3y\: minutes}$

$\red{ and \:25y \:seconds}\green {= 178y \:seconds }$

$\red {b) Sum \:of \:50(3z-2) \: minutes \:and \: 4(z+1) \:hours }$

$\green {= 60(90z+140)\:seconds }$

•••♪

Answer 2

Step-by-step explanation:

Bilal is y years old and his mother is 25 years old then he is how old is Bilal mother