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Answer 1 · 2018-01-08T11:26:47

#150#

#"using proportion"#

#70%to105#

#100%to105/1xx100/70=150#

Answer 2 · 2018-01-08T11:30:03

150

take the unknown value as x

x #xx# 70% #=# 105

#rArr# x#=#105#xx##100/70#

#rArr# x#=#150