Last week Martha read two fifths of an adventure book and this week she has read another one quarter. If she still has one hundred and forty pages to read, how many pages has the book got?
Answers
Answer:
400
Step-by-step explanation:
Let total pages in book be x
Martha read in last week = 2/5 of book
= 2x/5
Martha read this week = 1 quater you book
= 1x/4
Total pages she had read = 2x/5 + x/4
LCM of 4 and 5 is 20
= (8x + 5x)/20
= 13x/20
Pages left to read by Martha = x - 13x/20
= 20x/20 - 13x/20
= 7x/20
According to ques.
Pages left to read by Martha = 140
Therefore ,
7x/20 = 140
7x = 140×20
x = 140 ×20 ÷7
x = 20×20
x = 400
so,. Total pages in Martha book = x
= 400